When u say trailer length, do you mean total length or length from winch post. A 24 ft boat is not going to fit on a trailer that is 26 ft long
As far as bunk vs roller, personal choice. I like bunk, but my local ramp is short and steep. You have to submerge 80% of the trailer with a bunk. The boat has to float off. With a roller, just needs an incline. Bunk has no moving parts, roller has a bunch of them. With a bunk you can drive the boat to the winch post. With a roller, you winch it up. I do a lot of solo launching and i think bunk is a lot easier launching and loading.
I'd go with aluminum I-beam and torsion axles
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