Ours is a 40ft destination trailer on a seasonal in WI. We leave it there year round. On gravel.
I bought 4 screw jack stands from Menards, and 4 cinder blocks. Screw jacks on top of cinder blocks. I use the front electric jack and factory levelers to to level it. Then used the 4 screw jacks to support it. I have trailer "quartered" with the screw jacks to the factory levelers.
I do get a little sway when the kids, 2 young wild boys, go running through the trailer, but its alot better than my MH was. I might get those bars that go from the frame to the levelers that are supposed to prevent sway. But the only time I ever really notice it is when Im in bed. I get no sway at all from wind. But its not as windy here as it is in ND.
We all use PVC for our sewer as well.
