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More info: has axle code 25, so it's conventional with a ratio of 3.27.
How difficult is a swap to a code B9 (3.55) Traction-Lok?
Not sure on the swap, but I know there is some adjustment to get right. I think on the ramps you'll be fine unless you're getting the whole rear end down in the water on a shallow ramp. In that case you'll want the trac loc rear, and a taller gear wouldn't be bad either. I've got the 3.55 and its pretty decent, though I'm considering a 4.10 since going to a 15" wheel.
Back before the "cash for clunkers" program, I would see Aerostars towing boats weighing five or six thousand pounds.
But we do have very good boat ramps here.