I relocated my batteries on my last TT to reduce the TW. It worked well,BUT.... My TW was a lot due to my generator and 26 gallon fuel tank install.
TW questions appear here often. They always generate a lot of opinions. Most of them are right,,,, and wrong.
The reason is simple. Everyone bases their opinion on their experiences.. But someone could have the exact TT as I, and have TW that is hundreds of pounds different than I have. No two peoples usage, gear and loading will be the same.
8-10% may work for a light utility trailer, but is not a good idea for a TT.
TTs need more TW because when they start to sway, the box catches the wind like a large sail and makes it worse, AND many TTs weigh more than the TV... With those two factors working against a smooth tow, it is foolish to try to make the TW as light as possible.
And then there is another factor unique to TTs. During a trip, the weight in the TT shifts around quite a bit. FW gets used and ends up in the grey/blackwater tanks. Food/drink gets eaten and ends up in the black tanks. Propane gets burned and disappears from the TW. Clean clothes get worn and end up in the hamper etc... Other things may ride home in a different location for many reasons. So cutting it close on TW can be really bad.
TTs generally need 10-15% TW. More is better. But as a practical matter, 15% is usually the limit due to hitch and TV limitations.
I have a stout TV, so I like my TW heavy. I also have 4 42 gallon waste tanks that are full for the return trip... So my TW can really change a LOT.
