Towing boat behind 5th wheel

Brian Shack wrote:
I am biulding a hitch to tow my 23 ft jet boat behind my 24.5 ft 5th wheel.my boat and trailer weighs 7100lbs. I don't know the tongue weight but I can't lift it and it is very heavy. I thought of extending my boat trailer tongue a few feet but my neighbours thinks this will increase tongue weight? Thoughts please. I can't move the boat back farther on the trailer as this puts too much weight on the rear axle of the boat trailer.

Your not going to increase hitch weigh but a few lbs by increasing the length.
I towed doubles for 8 years with a 26' 5er and a 3500 lb 18' bass boat. The tongue on the single axle boat trailer was very short for pulling behind my truck so I increased it by 24". Weight gain was less than 20 lbs on the scales. Weight gain on a multi axle trailer would have been even less.

This is my 3rd 5er with a hitch that I had fabricated and welded to the trailers main frame rails and cross members. I don't mess with any type of bolted on hitch on the back of any trailer.