Greetings GolfPro! I have an ‘86 Hunter 34 with the same problem. When I bought the boat a year ago and looked down there to see three big gel cell house batteries, the fuel tank and all that wiring all I could imagine is somebody hired an oompah loompah to crawl in there! I’m 61, 6’3” and 245. I sure wasn’t gonna fit.
Well, as luck would have it, I had a lot of other work to do, including cleaning out the fuel tank - installed an access port in it from instructions on this site. So, I cut the walls out in the quarter berth in sections. Others have done pretty nifty jobs with installing easy access panels in that wall.
It’s not something you want to do every day, but once it’s done it affords access to the fuel tank, batteries and wiring that is otherwise inaccessible to us mere mortals.