I use a 16' dump trailer, 14,000lb and it's a little tight. FEL and BH hang out. Only load on a flat surface or heading up hill or you will go for a unfun ride, don't ask me how I know.
Dump trailer is no different than a flatbed trailer as far stopping and controlling, just make sure it has good brakes on 4 wheels and the load is spread out properly between the trailer wheels and the tongue so that there is enough tongue weight for control.