Wear in only inner rib on one tire on axle usually indicates one of two possible issues.
I’d first jack up side in tire that’s wearing and grab tire at 12 and 6 o’clock positions and wiggle top to bottom and back and forth. You are checking for either a loose wheel bearing or damaged bearing and race on that hub
If no play is felt I’d remove and inspect and clean and repack that axle bearing being sure you do the initial 50 ft lbs of torque on axle nut then back off the nut to install spring keeper in place. Or cotter pin.
Swap tires front to back on that side only...verify proper cold inflation pressures and then tow and monitor tire for signs of continued wear
If wear shows on that tire swapped on the axle then CAMBER is out on that axle on that side
A good trailer shop can correct that issue
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