it is generaly rated by wt. the trailer has to be able to handle the load.
if secuered well to the trailer you should do fine. go slow enouph to handle the inersha. a smaller trailer will be top heavy, but if the springs on the trailer will handle it you will do fine. i have seen loads hauled with blocks of wood to deadspring the springs. then it comes down to tire rating. go slow and let traffic pass if there is a need, there is no minimum speed limit. pull aside if there is a need.
your tail lights must show as well as licence plate