Why trailers need their own pad
A trailer pad has to handle two very different loads: the wheels, which spread the weight, and the tongue jack, which puts the tongue weight on one small foot. On gravel or dirt the jack sinks and the trailer tips; on a thin patio slab it can crack a corner. A pad built for it stays flat.
The other reason is the rules. In Phoenix, front and side yard parking areas must be dust-free. In Mesa, boats and utility trailers belong in a garage, a carport, the rear yard, or the side yard behind the front face of the house, on concrete, asphalt or bordered crushed rock.
| Trailer | Typical pad | Usual build |
|---|---|---|
| Utility trailer (single axle) | 8x16 to 10x20 | 4 in, reinforced |
| Boat on trailer (fishing or ski boat) | 10x24 to 12x28 | 4 to 5 in, reinforced; jack pad thickened |
| Toy hauler, enclosed cargo trailer | 10x28 to 12x32 | 5 in, rebar grid |
| Travel trailer | 12x30 to 12x40 | 5 to 6 in, rebar grid (see RV pads) |
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Size from the coupler to the rear bumper or boat stern, then add 2 to 4 feet. Typical practice, not engineering; the quote states the spec.
Laying it out for backing in
- Line the pad up with the gate so the trailer backs straight in, not around a corner
- Mark where the tongue jack lands and thicken or reinforce that spot
- Leave walking room on the side you load from
- Slope the pad away from the house and toward the yard
- If the boat drains when parked, give the water somewhere to go off the slab
For travel trailers and anything over about 30 feet, the build follows the RV spec. See concrete RV pads and the RV pad size guide.