When I first got "Lady-Bug" our Boler
13ft. It didn't ahve any battery hook-up and that was one of the first things I did.
I placed it under the rear dinette seat only to wish I had that storage room for other stuff so after the first season I also put it out on tongue.
A fellow Boler-ite gave me a battery tray and I had it welded onto frame and I already had the box and all I did was make a secure hold down with 1/8 rod that I threaded on the ends and put some nuts on bottom.
Worried about theft?
It never came to mind until someone mention it and I may figure a way of locking it in place.
Gerr the Canoebuilder