The lack of a rigid floor on the rollups discourages planing, and I'd suspect that unless your less than 150 lbs and by yourself that it's unlikely to plane easily with a 2 hp.
We run a 3 horse with a rollup zodiac, and there's no way it'll plane with me and my 200-ish lbs.
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)