Don't know about your area, but whatever you do...don't let them jack it up by the axle!
If they say "Oh, it's OK...I do it every day!"
And I'm sure you will hear those words from a lot of tire stores!
And that may be true...
But they aren't the ones footing the bill a couple of thousands of miles down the road when you have to replace the axles and the tires (and maybe some gas lines, wiring and fenders due to a blowout) because they bent the axles by jacking it up that way!
I prefer truck tires shops, usually found near truck stops!
And, make sure you get them balanced!
RV dealers will tell you that trailer tires don't need to be balance...
But what do they know...
They are the same people that told the other guy that his F/150 and/or 1500 truck can pull that 14,000 pound 5th-wheeler!