He thinks that would be a problem with the middle tire pivoting instead of going straight forward or backward. Tires aren't made to go sideways. Comments?
Most tri axle trailers I used to make a living had 5.2k axles or 6.k axle and a couple with 7k axles.
The Michelin XPS Rib or the Bridgestone R-250 both are a commercial grade all steel ply carcass tire in a LT235/85-16 E at 3042 lbs capacity work great on the 5k-6k axles.
I have one 36' tri axle GN stock trailer left with 7k axles. I just had 6 Sailun S637 commercial class tire with a all steel carcass in a 235/85-16 G at 3750 lb capacity put on this trailer. With my short bed Dodge/Cummins I can spin the fully loaded triaxle trailer 360 on the center axle on pavement or green grass.
The front axle tires and the rear axle tires are the ones that slide sideways (side scrub) as the trailer goes around a corner or backing much of the time. Which tires side scrub more can depend on terrain/a level trailer/etc.