Supposedly the stickers on the interior/exterior of an RV indicate dry weight and available CCC but how accurate they are and which manufacturers make it a priority to give exact weights is difficult to state. My current rig is 6 years old and was much heavier than brochure and a bit heavier than sticker weights but not enough to have much effect on the minimum CCC I required. Both dry weight and GVWR are important numbers for different reasons, weighing a rig loaded or unloaded is the only accurate way to determine where an RV sits in relation to these manufacturer stated weights. Don't know if there is a mandate or soon to be imposed mandate to accurately weigh each RV as it leaves the assembly line.
