I don't know what option remains but to question the rim. Maybe bent and letting air escape fast enough that it can't build enough pressure to seat the bead?
before or after this started ? if they replaced it and now it has the problem that would point to it being bad. never mind we posted at the same time, i see the orig. spare is back on and holding air !
The first installer who put on 4 of the tires, said they have a stiff sidewall.
The second installer said it was probably a defective tire the first time. I got a new replacement tire, and they still couldn't get it mounted. Said they didn't have the correct equipment, and it's a tire shop?
I really can't get a straight answer from them. My guess is they don't have experience mounting A/T tires.