Originally Posted by DocBrown
Just a clarification, trailers with stabilizers as opposed to leveling jacks have frames that can flex. In the case of a pop-up if you flex the frame the door may not line up, the roof may not crank up or down smoothly, and the beds may not pull out straight.
This is good advice. Most trailers do not have the frame rigidity for leveling on the corners. The frame can twist, creating problems in a pop-up described by DocBrown. In a travel trailer, the doors may not open and close properly and you are flexing the sides where they meet the roof - NEVER a good thing. Over time, the weather resistance at seams and corners can be compromised.
As mentioned earlier, level side-to-side with boards under the low tires, then level front-to-rear with the tongue jack. And remember to put down the stabilizers before moving any slides out.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)