I'm using the same set of lynx levelers I had for our 5er and the TT before it. So far they are a little strained but none have broke (I did pick up some "doublewide" blocks for the rears).
I installed a
Levelmate Pro on our RV so leveling with the blocks is easy as the Levelmate Pro tells me how many inches I'm out of level (and the blocks are approx 1" each). That has removed all the trial and error out of leveling.