I've got a LoadTrail from Countryside in Houston and I use a load leveler hitch.
I've not hauled a lot with my trailer but I think one part that can make a difference is which brake controller you use.
I'd have to look to see which one I have but I've been really happy with mine.
In addition to a spare tire, some other things to add to your trailer go-box:
Extra ratchet strap
Axle straps
Extra lug nuts
Full set of bearings
Bottle Jack
Breaker bar with lug nut socket
Extra safety clips for the ramp doors
Locking hitch cover
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