We have a roll-up zodiac, pumping it up on the foredeck is easy enough.
However the only time we bother is if we have company on board.. the rest of the time we use our two 9.5 foot plastic kayaks. They've proven excellent for all tasks and shore expeditions when it's just the two of us.
As to the outboard I'd suggest you look for a 3.5 hp - you get the added advantage of a neutral gear position rather than have the prop turning the instant you start it. For the roll-ups this is plenty of power since they are unlikely to plane in any event, esp with more than one on board. They are also light enough to lift up onto the rail pad one-handed so you're more likely to do it rather than tow the dinghy with the motor mounted on the transom.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Last edited by Faster; 08-21-2010 at 10:52 AM.