I would use the one which most equally divides the hull into 3 equal segments to most evenly distribute the load onto your supports, which is probably the rear one.
Thumbs up for this advice.
I have a multi-purpose trailer that I use to carry my raft & gear. It began it’s life as a snowmobile trailer with some modifications. Here’s a pic of how it started.
I added stake pockets all around the inner deck, and had 2 foot high metal mesh side panel sections made to enclose the inner deck for gear hauling. There are 6 panels in all (2 per side, 1 front & back). The side panels are easy to put on & take off. I don’t have a picture of the trailer with the side panels on. I added a wood deck with marine carpet over the metal textured deck. When I transport my raft inflated, I leave the side panels off and have 8 cross boards that attach to the flared side rails of the trailer.
My next project will be how to fashion a couple lightweight crossbars that I can attach to the side panels for carrying kayaks & canoes. If I can get the crossbars fairly even with the front & back panels, that would give me 4 points for boats to rest on & be secured to. I’d have my enclosed box for gear and I could carry 2, maybe 3 boats. My biggest issue is that my trailer has a short tongue, so boat length could be a problem. If I had it to do over, I’d get a trailer with a longer tongue.