A 40" or a 42" would be suitable as long as you aren't wanting to do backflips in the boat. I have fished out of a 42" bottom all of my life, and I have never had any problem at all. Never have I fallen out nor come close. The 48" will be much more stable, but a 42" will also have as much stability as you will ever need. If you are in the back of the boat and lean over the side, there will be SOME roll with whatever size bottom you go with. CEB -