Cheap Stable Photography - Old Canoe?

I’m thinking of something that I can watch the dawn from, or row out and watch bird nests…

My first thought is a big old freighter canoe, or something otherwise unsinkable. I don’t want to dunk my DSLR!

My only wish is that I can lift the thing by myself and fit it on my car…

What do people think?

Any other ideas come to mind? What would you look for in a cheap photography platform?