Factory installed auxiliary fuel tanks are really the only safe way to carry additional fuel, so installation at this point would be difficult and costly. I wouldn’t put any kind of tankage in the cabin because of the fact that fumes might be able to accumulate. I’ve heard of some people using bladder bags that sit on deck and can be burned off first, then folded up and stowed on the way home. I can only recommend a properly installed system that follows Coast Guard and ABYC standards. Call me to discuss if you like.
727-548-1260 ext. 229″