Levelling Fifth Wheel Side to Side

What everyone is posting, to add some leveling blocks under the wheels on the low side ... but what about up front under the landing gear? To keep from torquing the frame, I'd hitch up, raise landing gear, jack the wheels, then reset landing gear.

This was my experience when wanting to level the trailer prior to mounting a level on my pinbox. Trailer was in storage, I jacked up each axel, placed the necessary block under the wheel. Level in my kitchen, didn't change the bubble at the pinbox.