After some time working to have the ATM raised on our Jayco Sterling pop top 17.55-7SH, we have now raised it to a reasonable ATM capacity and still under the axle/axle load capacity. Jayco was no help, so we had to go to a Vic Roads VASS engineer not easy to find one that will work on caravans. We didn't have to do anything to the caravan to have the ATM raised, the first question from the engineer was, what is Jayco hiding not to give the design load capacity of the chassis. If Jayco had only put it on their letterhead that our weights we wanted were alright, we wouldn't have had to go to an engineer at a cost . Tare weight should be with the caravan ready to go, with gas and water in the tanks. My thought is if the ATM is keep low so they can sell more caravan's to people with low towing capacity vehicles. The caravan industry and caravan manufactures should be more accountable, as this could be dangerous not so much with the caravan carrying capacity but the vehicle not being the right size to tow the caravan.