i finished modifying a used boat trailer for my achilles inflatable 10ft. used trailer size 15ft long 48 inches wide channel to channel. very rusty but still usable, i cut off all un usable brackets i did not need. Wire brushed all the trailer primed and painted trailer with oil base paint. I had two support bunk frames made by a local iron fence co. VERY REASONABLE both the same size i cut the from frame for keel clearance the rear frame i added a transom support, my achilles has a v shaped transom. Think i have enough bolts on the transom support? When perfection is unattainable, Good is good enough!. sib fun.