i used to work in the race trailer division of an rv lot. we sold big tex along with many other brands like haulmark, TPD and whatever we could get in on trade ins. the big tex seemed to be well built. i believe they have leaf springs on them though. at least they did when i was selling them.
if i go the trailer route i will try to get torflex axles. the wheels will work independent of each other for a smoother ride and better tracking. its like a torsion bar and sort of resembles a portal axle near the wheel.
i have pulled both kinds of trailers many times and it is clear to me which axle i would choose if i had the money
with that said i will probably still have to go with the big tex with the leaf springs. ..lol... um, since i don't have any money.
TORFLEX AXLE