I've been thinking about picking up or building a small boat to take when camping near lakes. There are 5 good sized lakes within 50 miles of home, and they all have great camping.
I was looking at jon boats over at the local Cabelas, and was shocked to see the capacity of the smallest one: Two persons or 180 lbs.
Now I looked at the next two sized up, and way before I found one with a capacity as large as my butt, I was way out of my price range. Forget about taking my beloved!
Now depending on if it's before of after lunch, I weigh in at 225 - 250 lbs. (I'm 6'4, so not the lard casing you might imagine, but I haven't been skinny in a while). My beloved is 5'8, and she'd shoot me if I gave her weight here or anywhere else, but she is thin. Suffice to say I'd need a capacity of 400 lbs to carry her, me, and a tacklebox.
Now the question: Are there formulas for sizing boats to butts? Is the issue on the jon boat the water displacement, or the aluminum? I'm actually thinking of something I could put a trolling motor on, and carry on the pickup in front of the weekender.
Something like this

Any info would be appreciated!