I guess it would depend on how much of a load the line was under. I've managed to tie a bowline in a lot of unfavorable situations, but being towed in the water at 5 knots makes me wonder if I could do it. My first choice would be a bowline because I'm so familiar with it and can do it "blind", but I might get more familiar with the rolling hitch now that you've brought it up.
SV Laurie Anne
1988 Brewer 40 Pilothouse