I use the aluminum tripod with TrailAir hitch pin with the normal 80 lbs pressure..........works great, rig is more stable. Last weekend I installed 7500 lb BAL scissor jacks 1-1/2" behind the rear axle spring hanger..........better yet. The BAL scissor jacks will lift both tires off the ground, but is extremely weak in every lateral direction, not a good idea to use for changing tires, especially on unleveled ground next to the big rig travel lane, definitely do not try to lift all four tires off the ground at once, the jacks will roll moving the rig sideways.
BAL advertises 7500 lb capacity, not for lifting tires off ground, not for tire changing, use only hand crank supplied and not a cheater bar. I used the hand crank supplied and could only lift the rig about two inches before I could not turn the crank any further. I was able to lift both tires off the ground with the help of an impact wrench or 18" breaker bar. Even though the jack will lift both tires off the ground, I would recommend a 6 ton jack-stand under the frame as a backup, just in case, before removing any tires.