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10 Years of Testing. Engineered for RSI SmartCap. 1000 lbs Static Capacity.
The World's Strongest Cap-Mounted PlatformThe Leitner Designs ACS ROOF is the result of 10 years and hundreds of thousands of off-road miles. Specifically engineered to integrate with the RSI SmartCap, this modular, heavy-duty aluminum rack system is built to carry rooftop tents, gear, and commercial tools with absolute confidence.
Designed, engineered, and manufactured in Corona, California, this rack utilizes custom 6061 T6 aluminum extrusions that offer over 2X the yield strength of typical systems. It solves the biggest headaches of cap racks: flex, difficult assembly, and permanent damage from drilling.
The Problem & The Solution:The Pain: Many truck cap racks require drilling into the shell, leading to leaks, or they are too flimsy to support heavy rooftop tents.
The ACS Solution: Our platform is a 100% Bolt-On design that mounts directly to your SmartCap’s factory T-slot tracks using eight 8mm bolts. No drilling, no fabrication—just rock-solid performance.
Note: Please review all specifications and dimensions carefully before purchasing to ensure proper fitment with your RSI SmartCap or truck cap.
Key Features: The ACS Cap Platform
Mounts directly to existing factory T-slot tracks on your SmartCap. Secures tightly into pre-installed track nuts for a zero-damage install.
Custom heavy-duty aluminum extrusions provide unmatched rigidity for overland performance and commercial utility.
Fully adjustable crossbars slide along the rack length. Mount your rooftop tent exactly where you want it.
Laser-cut from 1/8" zinc-plated, powder-coated steel. Engineered for flex-free performance on washboard roads.
Standard T-track design works seamlessly with Yakima, Thule, and other overlanding accessories.
Installs in under an hour with basic hand tools. All hardware is included for a frustration-free setup.
Features high-strength Grade 10.9 black fasteners with Zi-Ni coating and Loctite to prevent loosening under vibration.
Efficiently ships via UPS Ground in a single flat-pack box, reducing shipping costs and environmental impact.
Engineered in the USA for Extreme LoadsWe don't cut corners. The ACS ROOF features heavy-duty aluminum construction with a dual-stage powder coat finish. Whether you're a contractor hauling jobsites gear or an overlander carrying a 3-person tent, this system is built to "Carry Your World."
300 lbs Off-Road Dynamic 500 lbs On-Road Dynamic 1000 lbs Parked Static 45-56 lbs Product Weight
"The integration with the RSI SmartCap is seamless. I was worried about noise and strength, but the ACS Roof platform is dead silent on the highway and doesn't budge with my iKamper on top. The bolt-on install into the SmartCap tracks was incredibly easy—no drilling into my expensive cap was the biggest win."
- Brandon K., Overland Adventurer Compatibility & Dimensions CheckThe ACS ROOF was designed for the RSI SmartCap; however, if your truck cap has an aluminum mounting rail, it may fit. Check your dimensions against the adjustment ranges below:
| Part Number | Max Rail Width (Pass-to-Driver) | Min Rail Length (Front-to-Back) |
|---|---|---|
| 00-GTCR-1801 | 50" | 38" |
| 00-5.0MTCR-1802 | 40" | 38" |
| 00-5.6TCR-1803 | 48" | 38" |
| 00-6.6TCR-1804 | 48" | 44" |
| Feature | Leitner Cap Platform | Generic Cap Racks |
|---|---|---|
| Installation | ✓ Direct Bolt-to-Track | ✗ Often Requires Drilling |
| Material | ✓ 6061 T6 High-Strength Aluminum | ✗ Lower Grade 6063 Aluminum |
| Hardware | ✓ Grade 10.9 Zi-Ni Coated | Standard Stainless/Zinc |
| Load Rating | ✓ 1000 lbs Static | Usually 500-600 lbs |
| Origin | ✓ Made in USA | Imported |
Whether you're heading into the backcountry or hauling gear to the jobsite, the ACS Roof Platform delivers elite-level modularity. It is trusted by fleet operators and overland contractors for its ability to handle vertical loads without shifting or bowing.
RSI SmartCap Models: Precise fitment for bed lengths from 5’ to 6’-1/2”. Custom Caps: Fits most caps with existing aluminum T-slot tracks.
CA Residents: ⚠️ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Yes, if your truck cap features aluminum mounting rails. Please check the Adjustment Range in our specification table above to ensure your cap's rails fall within the max width and min length requirements for the specific part number.
No. This system is designed as a 100% bolt-on assembly. It uses existing T-slot tracks and factory track nuts for a secure mount without compromising your cap's integrity.
The platform itself is rated for 1,000 lbs Static and 300 lbs Off-Road Dynamic. However, you should always verify the weight capacity of your RSI SmartCap or specific truck cap shell before loading to the rack's maximum limits.
We use Grade 10.9 black fasteners with Zi-Ni coating to prevent corrosion. However, we recommend periodically checking the torque on the mounting bolts, especially after long trips on washboard or corrugated roads.
California Residents
Prop 65 Warning- Product may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov
Proposition 65 is a California law passed in 1986. Its goals are to protect drinking water sources from toxic substances that may cause cancer and birth defects and to reduce or eliminate exposures to those chemicals generally, for example in consumer products, by requiring warnings in advance of those exposures.
The regulation requires the State of California to revise and republish yearly a list of chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. The current list contains over 900 naturally occurring and synthetic chemicals. This regulation also requires manufacturers to place warnings on products that contain any of the chemicals listed by the State of California. No other states require warnings of this nature, and products with Prop 65 warning language are legal to sell in all states. Detailed information regarding requirements for compliance to the California Prop. 65 is can be found at: www.P65Warning.ca.gov
We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ExtrailAuto.
The wait time was more than I anticipated even after seeing the notification of long lead times. I have to give them props for giving some compensation for the excessive wait time. Having slightly larger holes would help with fitment. Had a hard time getting the front drivers side away from the pinch weld. Eventually had to use washers to add space away from the truck. Need to update pictures and instalation video for the new sliders they are now making
All packing and shipment were great, everything was there. I had to contract out the install because of arthritis, it took them two hours and looks perfect. Zero wind noise at any speed 0 to 100.
Absolutely love my new rack and roam cases. Appreciate the Sherpa crew as well for their hospitality while the installation was taking place.
Fit and finish is excellent. Looks great on the Bronco. No whistling noise at all, some additional wind noise over 60mph but not much different than it was without the rack. Assembly was not too difficult. Instructions and videos could be a little better.
The quality and dedication of the team at Sherpa is evident from the very first interaction with them, and is further proven in the product itself. This rack is well engineered, easy to assemble, easy to adjust, and holds up incredibly well with no loosening or rattling or shifting (even after over 200 miles of driving on poorly maintained roads). Currently operating with approximately 180 pounds of gear mounted on the bed rack and no issues at all so far. I expected the vibration to work the bolts loose over time, but every time I check they're all still snug. My only regret is that I didn't pull the trigger and get this rack sooner.
First of all, the team at Sherpa is full of passion for adventure and that passion shows in the quality of their products. This roof rack looks incredible and surprised me with it's sturdiness. No loosening of hardware, even after weeks of driving. Currently holding approximately 80 pounds of gear for everyday driving, plus an additional 110 strapped on top during a camping trip (and I even stood on top of the entire loadout). No warping, bending, twisting, or slipping. The fact that this matches the bed rack perfectly in height is the icing on the cake. Easily serves as a tie off for a tarp, rain fly, hammock, or whatever you need. Perfect for modular campsite setup and quick teardown.
I bought the Sherpa Crestone rack for my 2024 4Runner TRD Pro. Incredibly well-made and excellent design. Spend the extra , to get best roof rack in the market. You won’t regret it.
This is our first roof rack that we are going to use to put a RRT (roof top tent) on for back country trips. Well-built product that came with all the nuts, bolts and washers to complete the installation. Took about 1-1/2 to 2 hours install the rack. You will another person to help place the racks on top of the Jeep for final install. Overall, a great, well-built American product
Install was super easy. The quality was great. Customer service was quick to respond to any issues! I’ve already been getting compliments on it and what brand it is. This will be great for camping this year!
This is on my tundra absolutely solid rack looks fantastic extremely modular, which is why I went this route. I can use the whole rack when traveling and over landing then rock the chase rack only when the rest is not in use, I actually use the recovery traction board mounts for my shower room set up, which works amazingly just relocated the board somewhere shown in picture keep innovating TUWAand I’ll keep purchasing.
Good looking cat shields made of stainless steel with cooling holes. Priced well, easy install, no issues. Would buy again.
Great service from their staff. Robert help me through all the process with a request I had, he responded all emails in a timely manner and provided great help.
We received it within 3 days and installed the same day. Great awning and very well made.
the tent is very nice, comfortable and roomy.
Following the instructions was fairly easy. Its better to have second person to set it up. I really like the tent and the support that from ExtrailAuto. Really recommeded! Thanks
