I expect a 2000lb rated axle as well, likely same as this Lowes trailer
Shop Carry-On Trailer 5-ft x 8-ft Wire Mesh Utility Trailer with Ramp Gate at Lowes.com
1650lb payload ain't half bad actually, even with some sides installed you'll need some hefty stuff to overload that one New
With that wide wheel base you don't need to worry much about it flipping, just load it evenly, avoid acrobatics, and don't drive too fast for extended periods, 12" tires turn fast at 70 mph, so your main concern would probably be burning the bearings up (did I recommend my once over axle check? ; )
I don't much care for those rear gates, maybe good for loading lawn equipment, still, it's gotta be about like pulling a sailboat backwards with its sail open, but, you've got to just kinda go with what you got now. I guess if it was me, I'd be looking for a way to "easy off" that gate and maybe finding a shorter substitution : )
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