I have a 8'x16' 25k big tex dump trailer. It works perfect. I can theoretically load 17 k. That is no where near "full" as far as volume goes. That works out to about 5-6 yards of crushed concrete. It just barely dumped. Hydraulics aren't up to that weight. I now haul about 10-12 k and it works perfect.
Battery would last only 3-4 dumps with small charging wire. I ended up running #2 wires from the battery on the truck to make it last all day and as fast as I can make a run.
Pay attention to dump agle. 45 degree is about right. Anything less and sticky material won't dump. Scissor lift only. Dual cylinders seem to be problematic.
Back into your GCWR of you vehicle and get the biggest volume trailer you van afford.
Gooseneck is far easier to handle than the smaller bumper pull I used before.
Shop for a servicing dealer. That's going to be more important than the brand.