If you mean a trailer to haul my tractor with I have a 22" PJ 14K tilt bed and a 16' 14K dump trailer.
I have towed both of these behind the tractor also but don't have a dedicated small trailer to tow with the tractor.
My trailer for hauling the tractor and my trailer for pulling behind the tractor are the same. In both cases a 14'x7' (deck between wheels), 10,000 GVW flat bed with wood sides.