[travelin texans]

The dry weight posted on a tag inside every RV tells you only 1 thing 1 time, that's what it weighed when it rolled off the assembly line with no propane, only the bottles, no battery & never an ounce of liquid of any kind on board, it will NEVER weigh that EVER again. It will be of absolutely no help for the buyer in determining a suitable tv. The buyer should only be using the gross weight to determine percentages for tongue/pin weights. Better to figure too high than too low!
As max truck tow weights, a flat bed trailer loaded to 10k pounds of cement blocks with the load not stacked above the truck bed is totally different than towing a 10k rv with the aerodynamics of a gigantic one of the cement blocks. If they want really want to give helpful info show hauling the blocks then a RV of the same weight both in a 30 mph crosswind & see if there's a difference.