There are many methods for getting a trailer level, and hydraulic leveling is a blessing that takes all the excitement out of it. For those without hydraulic leveling, we found in our early years that with two 5′ lengths of 2″x8″ board and one 5′ length of 1″x8″ board we could always find a combination that worked to get the trailer level from side to side. A 5′ board is relatively easy to drive onto and provides a solid platform for the trailer’s wheels.
We store the boards in the bed of the pickup. When using two boards, we stagger them a few inches so the trailer is driven first onto one level and then up a step to the next. We have to remember to back up when coming off stacked boards or the upper one will tip up and hit the bottom of the trailer while driving off it (think of a sailor walking the plank).
If you don’t like the idea of hauling long boards around in your truck, there are nifty plastic leveling board kits (here’s another type) that are very popular.
We also use plastic wheel chocks whenever we park on a steep incline to prevent the trailer from rolling, especially while unhitching and hitching up.
Our friend Ken introduced us to using a sliced up horse stall mat rather than pine boards. We cut a 4’x6′ sheet of horse stall mat into five 1×5 strips and four 1×1 squares, and those have worked really well for us. They hold up to the elements really well and they roll along with the contour of whatever crazy surface we might park on. It is also possible to drive off of them either forwards or backwards because they don’t slap the underside of the trailer.
The only disadvantage is that they are much heavier than pine boards, but we can drag them around and they don’t disintegrate. We use the 1’x1′ squares under the landing legs and scissor jacks for cushioning.
We also have four large blocks made of three 1′ lengths of 2″x8″ boards screwed together. We put handles on the ends to make them easy to lug around. In a really unlevel site in the Smoky Mountains we had to stack them on top of each other AND extend the jack legs all the way!