The Mike boats were 56 feet and the Papa (Higgins) boats were 36 feet. Besides the Marines, a Papa boat would land a jeep and it's trailer. Of all the jeeps I landed not one could drive off the beach. All had to be towed. I have movies of this if I can ever send them.  i think the Mikes could land a 2 1/2 ton truck but I can't recall ever seeing one. Anyway, I enclosed a picture of a Mike with two jeeps and their trailers side by side. We couldn't land tanks. They were carried by LCUs which were over 100 feet long.