My 15-foot fiberglass fish/ski overhangs the back roller on the trailer by about 5.5 inches. Everything I read says it shouldn't. Trailer tows nicely now and I have rigged up a rear extension so I can use an engine support bar for going down the highway. I can move the bow tower forward 5.5 inches, but it looks like doing so will crowd the tongue. Is there a rule of thumb for how long the tongue should be from ball receptacle to the bow tower? The tongue weight now is just right and the boat seems nicely balanced on the trailer as it is. Any advice from the more experienced?