Back in the day, we use to put a little dawn dish washing liquid, maybe 5% to 95% water in a container that hung on the tire machine. Apply that liberally around the rim and tire beads with a little cotton tipped metal swab and the tire will seat effortlessly.
Here's a trick, do the above prep then place a ratching tie down strap around the circumference of your tire. Your beads should be touching the rim now. If not apply more pressure with ratchet. Start air into tire and take strap off when you hit about 15 lbs pressure. Then seat. Like i said before , if your tires lubed it should pop on effortlessly.
I also like to apply mixture before taking old tire off, it realy helps.
Shouldn't have to ever use more than 50 lbs. to seat a tire or you stand a good chance of ruining it. That being said, I'll admit I dont know anything about Truck tires, but if they take more than that I'm going to be in the next room. Know a guy that was leaning over his quater midget race tires and was blown through the floor of his house. He lost many many body parts and went through years of surgery.
Another thing, have more than one tire gauge. If they start to stick buy a new one. Its not worth a tire blowing up on you.
