I tow a fiberglass 13' lightweight Whitehall behind my Flicka 20 and Gardner 18' workboat; very little resistance, probably even less than a RIB, and handles rough seas behind the boat with ease. It can easily carry two adults plus gear to a beach or dock. I've safely rowed her solo even in waves up to 3'.
Towed a Montgomery 6'8" behind my M17.
I tow a fiberglass 13' lightweight Whitehall behind my Flicka 20 and Gardner 18' workboat; very little resistance, probably even less than a RIB, and handles rough seas behind the boat with ease. It can easily carry two adults plus gear to a beach or dock. I've safely rowed her solo even in waves up to 3'.