When I bought my 05 Fleetwood on a Freightliner XCS the sticker on the hitch said it was rated for 10000 pounds 1000 pound tongue weight.
About a year later I received a letter from FL along with a new sticker that said they derated the tongue weight to 500 pounds and if you towed over 5000 you had to have an equalizing weight distribution system.
It didn't affect me as all I towed was a Honda and sometimes a 2500 trailer.
But there were a few here that we're towing big car trailers that were affected and pi$$ed off.
I wonder if your chassis was mixed in that issue and just handled differently?
Have looked carefully at your sticker to see if there is an old underneath it?
