You don't need to worry about stress on the axles from X chocks. You do not need to tighten them enough to actually move the axles. They just make the tires work with each other to eliminate back and forth rolling. I simply put them between the tires, tighten until contact is made with both tires, and then a couple more notches on the wrench and I'm done.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.