rest on the short lever arms of the tiltable ramps 22 as shown in fig4 and as further shown in fig1 the operator 86 has connected the first support assembly 25 to the boat trailer 78 by chains 88 more specifically chains 88 have hooked ends 90 which can hook into receiving portions of the boat trailer 78 the chains 88 are connected to a drum 92 supported by brackets 94 furthermore the drum 92 is equipped with a ratchet assembly 96 that permits the chains 88 to retain desired tautness until the ratchet assembly 96 is released the chains 88 can be tightened by a drum lever 97 the drum 97 ratchet assembly 96 drum lever 92 chains 88 and hooked ends 90 are of conventional commercially available design as shown in the drawing figures the drum 92 for the chains 88 is fixed to the first support assembly 25 toward the front side of the fulcrum 55 and the chains 88 are attached to the boat trailer 78 on the rear side of the fulcrum 55 by this arrangement tightened the chains 88 results in the boat trailer 78 being pulled toward the front side of the fulcrum 55 and loosening the chains results in the boat trailer 78 being moved by gravity toward the rear side of the fulcrum 55 generally it is desirable.