Pro-Cart AT4 — Premium All-Terrain Slab Cart with 1,200 lb Capacity and Quick-Release Clamping
The Pro-Cart AT4 is Omni Cubed's next evolution of the Pro-Cart line, engineered for contractors and stone fabrication crews who need to move full stone slabs, panels, and countertop pieces across demanding jobsite conditions including curbs, stairs, gravel, lawns, and other rough terrain. With a 1,200 lb load capacity and 9" closed-cell polyurethane all-terrain tires, the AT4 is built to reduce the physical burden on workers during heavy shop-to-site material transport. The cart features an upgraded Quick Release Speed Clamp with a 4.5" maximum opening, accommodating thicker materials, mitered pieces, and larger edge profiles. An included Folding Kit allows the caster rails to rotate beneath the support beam for compact storage and easier transport between jobs.
Technical Specifications
| Specification | Details |
|---|---|
| SKU | PCAT4-26 |
| Load Capacity | 1,200 lb |
| Clamp Opening (Max) | 4.5 in. (114.3 mm) |
| Deck Height | 16" from deck to ground |
| Doorway Clearance | 64 inches of clearance for material through standard doorways |
| Tire Size | 9" closed-cell polyurethane |
| Product Dimensions | 56-1/2" x 22-1/2" x 22-1/4" |
| Folded Dimensions | 56-1/2" x 12" x 16" |
| Product Weight | 69 lbs |
| Package Dimensions | 58" x 15" x 11" |
| Shipping Weight | Box 1: 35 lbs, Box 2: 40 lbs |
| Support Rail to Ground | 15" |
| Between Clamp Uprights | 45-1/4" |
| Support Rail Length | 56-1/2" |
| Width at Outside of Tires | 20-1/4" |
| Frame Material | Anodized aluminum framework; machined billet aluminum tightening handles; stainless steel clamp shafts; stainless steel and zinc plated steel hardware |
| Padding & Protection | Grey non-marking clamping pads; EPDM padding strips on support rail; protective silicone end caps; silicone caps on contact points |
| Wheelbase | Adjustable wheelbase range |
| Includes | One cart with two holding clamps, one folding kit |
| Ships Within | 3–5 business days |
Pro-Cart AT4 vs. AT3 Comparison
| Specification | Pro-Cart AT3 | Pro-Cart AT4 |
|---|---|---|
| Load Capacity | 1,200 lbs | 1,200 lbs |
| Clamping Range (Max) | 76.2 mm (3 in.) | 114.3 mm (4.5 in.) |
| Product Weight | 64 lbs | 69 lbs |
| All-Terrain, Flat-Free, Non-Marking Rubber Tires | Yes | Yes |
| Easily Goes Up Stairs | Yes | Yes |
| Quick-Release Clamp | — | Yes |
| Folding Kit Included | — | Yes |
Compared to the AT3, the AT4 delivers a significantly wider 4.5" clamp opening versus the AT3's 3" opening, making it the right choice for thicker slabs, mitered edges, and more complex material profiles. The AT4 also adds a quick-release clamping mechanism and an included folding kit — features not present on the AT3 — giving crews faster setup, easier adjustment, and more compact storage without sacrificing the same 1,200 lb load capacity.
Key Features & Benefits
Quick Release Speed Clamp with 4.5" Opening
The upgraded quick-release clamping mechanism allows for faster, easier adjustment without removing the clamp from the cart, reducing downtime during material handling. The 4.5" maximum opening accommodates thicker slabs, mitered pieces, and larger edge details that a standard clamp cannot grip securely.
9" Closed-Cell Polyurethane All-Terrain Tires
The flat-free, non-marking 9" closed-cell polyurethane tires are engineered to roll over curbs, stairs, gravel, lawns, and other rough terrain without damaging finished surfaces. Their larger diameter improves stability and control when navigating jobsite obstacles under heavy load.
Anodized Aluminum and Stainless Steel Construction
The anodized aluminum framework combined with machined billet aluminum handles and stainless steel clamp shafts delivers a corrosion-resistant, high-strength build that holds up to repeated heavy-duty use in demanding shop and jobsite environments. Zinc-plated steel hardware and radiused corners on all extrusions further extend service life and reduce snag points.
EPDM Rail Padding and Silicone End Caps
EPDM padding strips on the support rail and silicone caps on all contact points protect slab surfaces from scratching or chipping during transport. Grey non-marking clamping pads ensure finished stone faces are not marred when the clamps are tightened.
Included Folding Kit for Compact Storage
The folding kit allows the caster rails to rotate beneath the support beam, reducing the cart's footprint for storage in a shop or transport in a vehicle. Folded dimensions of 56-1/2" x 12" x 16" make it practical to store multiple units or fit the cart into tighter cargo spaces.
Adjustable Wheelbase
The adjustable wheelbase range allows crews to fine-tune the cart's stance for improved balance and control depending on slab size and terrain conditions. This adaptability helps maintain stability when moving large, cumbersome pieces through doorways or across uneven ground.
Common Applications
Shop-to-Site Stone Slab Transport
Move full stone slabs from fabrication shop to installation site, including loading and unloading from vehicles, without requiring multiple workers to carry material by hand.
Navigating Stairs and Curbs
The AT4 is designed to go up stairs and over curbs, allowing a crew to transport heavy slabs into buildings or across elevated thresholds that would otherwise require a lift or additional labor.
Rough Terrain and Outdoor Jobsites
The 9" all-terrain tires handle gravel, lawns, and uneven ground, making the AT4 suitable for outdoor residential and commercial jobsites where smooth pathways are not available.
Countertop and Panel Installation
Transport large countertop pieces and panels through standard doorways with up to 64 inches of material clearance, reducing the risk of damage during tight-space maneuvering.
Thicker Material and Mitered Edge Handling
The 4.5" clamp opening accommodates thicker slabs and mitered edge profiles that exceed the capacity of standard slab carts, expanding the range of materials a single cart can handle on a job.
Finished Surface Protection During Interior Moves
Non-marking rubber tires and silicone-capped contact points allow the AT4 to be used on finished floors without leaving marks or causing surface damage during interior installation work.
Compatible Materials
- Natural stone slabs (granite, marble, quartzite, travertine, limestone)
- Engineered quartz slabs
- Porcelain and large-format tile panels
- Countertop pieces and prefabricated sections
- Mitered edge and thicker-profile stone pieces (up to 4.5" clamp opening)
- Glass and other rigid panel materials within the 1,200 lb load capacity
Product Documents
Frequently Asked Questions
Q: What is the maximum clamp opening on the AT4?
A: The AT4's Quick Release Speed Clamp has a maximum opening of 4.5 inches (114.3 mm), which accommodates thicker slabs, mitered pieces, and larger edge profiles.
Q: How does the AT4 differ from the AT3?
A: The AT4 features a wider 4.5" clamp opening compared to the AT3's 3" opening, adds a quick-release clamping mechanism for faster adjustment, and includes a folding kit for compact storage — all at a higher price point. Both carts share the same 1,200 lb load capacity and all-terrain, flat-free, non-marking tire design.
Q: Does the AT4 include a folding kit?
A: Yes. The AT4 ships with one cart, two holding clamps, and one folding kit. The folding kit allows the caster rails to rotate beneath the support beam, reducing the folded footprint to 56-1/2" x 12" x 16" for easier storage and transport.
Q: Will the AT4 tires mark finished floors?
A: No. The 9" closed-cell polyurethane tires are flat-free and non-marking, and the clamping pads are grey non-marking rubber, making the cart safe to use on finished interior surfaces.
Q: Can the AT4 navigate stairs?
A: Yes. The AT4 is specifically designed to go up stairs as well as over curbs, gravel, lawns, and other rough terrain encountered on typical jobsites.
Q: How is the AT4 shipped?
A: The AT4 ships in two boxes — Box 1 at 35 lbs and Box 2 at 40 lbs — with a combined shipping weight of 75 lbs. All products ship within 3–5 business days.