Jetstream,
you could be alright with a 115 if you weren't in strong inlet currents or running far offshore. But it would be a strain on the motor over time. A low pitch/high diameter prop could pull it off.

But a single axle trailer that is definitely of insufficient GVWR for a v20 is out of the question. Unsafe and illegal to operate. Any dealer that would sell such a package is a damn fool lookin for a lawsuit.

PS -- no malice perceived or intended. This site is about fun things to know and do. ;D