Camco
Camco heavy-duty leveling blocks: tires, jacks, and tongue jacks in 1-inch layers
Interlocking yellow blocks. The 10-pack 44505 listing is 8.5 by 8.5 by 1.5 inches, and Camco says each nested block adds 1 inch of height. The same shape works under a tire, a tongue jack, or a stabilizer.
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8.8/10 RigRank score
The 44505 10-pack (B00480BWCI) is the block most rigs should start with. The listing gives the piece size as 8.5 by 8.5 by 1.5 inches and says that as the blocks nest, each one adds 1 inch of height. The 4-pack listing (44501) says the same thing more directly: each block adds 1 inch to the stack. That 1-inch step is what the leveling calculator uses as its default.
Blocks win when the thing you are lifting is not a tire. An Andersen leveler does not belong under a tongue jack. A Camco block does, and the listing names single wheels, dual wheels, hydraulic jacks, tongue jacks, stabilizers, fifth-wheel jacks, and tandem axles. Ten blocks is enough to build two modest stacks and still have pieces left for the jack. Four blocks is a spare kit, not a kit for a tandem on a crowned site.
The failure mode is the stack, not the plastic. A tire that is wider than the stack, or a stack taller than the tire's contact patch, walks off. Camco's separate FasTen 10-pack (B07ZHP8XFD) prints a stack limit of 4.5 inches. We use 4 inches as the calculator's warning line, under that printed cap, and we say so on the tool. The heavy-duty 44505 listing we read does not repeat the 4.5-inch sentence, so follow the sheet in the box you actually buy.
FasTen blocks are a different product: the listing says 8.5 by 8.5 by 1 inch, with a T-handle, and the same 4.5-inch stack cap. They interlock with other FasTen pieces. Don't assume a FasTen cap clicks onto a 44505 block. The XL FasTen (10.5 inch) exists too; we did not make it a pick because the standard footprint already matches most trailer tires and the XL is another thing to store.
What the listing actually says
| Piece size | 8.5 × 8.5 × 1.5 in (44505 listing) |
|---|---|
| Added height | 1 in per nested block |
| 10-pack | Model 44505, B00480BWCI |
| FasTen cap | 4.5 in stack, stated on the FasTen listing |
| Checked | Live Amazon listing on 2026-11-10. In stock that day. |
Works in its favor
- Listing: each nested block adds 1 inch, so the math is boring and repeatable
- Works under tires and under jacks
- 10-pack includes a zip bag. Bright yellow is hard to leave on the pad
Holds it back
- One-inch steps are coarser than an Andersen half-inch
- Stacks sink in gravel and mud unless you put them on a pad
- A tall stack is a roll-off risk. FasTen's own listing caps stacks at 4.5 inches
Which listing to open
- Heavy-duty 10-pack, model 44505 B00480BWCI on Amazon
- 4-pack, model 44501 B00480BWBE on Amazon
- FasTen 10-pack, 8.5 in, model 21022 B07ZHP8XFD on Amazon
Questions worth answering first
Is the block 1 inch tall or 1.5 inches tall?
The 44505 listing says the piece is 1.5 inches thick and that each nested block adds 1 inch of height. The interlocking lip is why those two numbers differ. The calculator treats one block as 1 inch of lift, which matches Camco's 'each block adds 1 inch' line.
How high can I stack them?
The FasTen listing says not to exceed 4.5 inches. Keep the whole tire contact patch on the stack, and treat anything over 4 inches as a reason to move the RV. Follow the instruction sheet in your box if it is stricter.
See where this sits in the Best RV Leveling Gear in 2026 roundup.