After levelling side to side and with the trailer still hooked up, I place a chock behind the rear wheels of the TT(both sides). I then back up a couple of inches until the chocks are tight against the tires. I put the e-brake on so it doesn't roll forward, and put a second chock in front of the wheels. Go back to the TV, disengage the E-brake and put the tranny in neutral. The trailer will roll forward a touch to put equal force on all the chocks. I then unhook the truck and level the trailer fore and aft. Makes the trailer much more stable.
I lower the stabilizers on the slide side first then put the slide out. If I can, I use enough blocks so that the jacks go down no more than 8 inches or so. I place the blocks on an angle of 20 degrees or so. The trailer raises maybe an inch. I then lower the stabilizers on the other side the same way, raising the trailer an inch or so. I then check each one to try to get the force as equal as I can on all four corners.
Check the doors to ensure no binding. If I haven't screwed up, the trailer is much more stable than it would have been just using a set of two chalks. I usually have to snug up the jacks after a day or so to look after any settlement.
Works for me! But then I don't have kids jumping around on a top bunk!