Pulled non RV trailers for a living. I've found its the tires on the front axle that gets more abuse. I'll put the new tires on my front axle. Biggest reason I do is when all things are equal its the front tires that may slide first on a hard braking event. The front axle tends to be lifted some what because of braking rotational forces through the equalizer bar.
Wear ??
Depends.
Nose high trailer will wear the front tires as the tires side scrub around corners.
Axles placement.
Loads on each axle/road surface can change while turning a corner. I've watched the front axle scrub first then the rear axle starts side scrubbing. Then on a very flat/level surface one tire may do all the side scrubbing.