Thanks for all he ideas. I know that trim works well on my v hulls,
but I've never used a tube boat. And seeing it's not a v or tri-hull
etc, I was wondering about the trim's effectiveness on a two-rail type
system. Yeah, I suppose I'll find out one way or another.

I have noticed that pontoons sit low in the back anyhow, and with
people on it, the things sit low everywhere.

True, this might take a bit of experimentation.