I had doubts on my old TT capacity. Filled it until overflowed. Drained it into 5 gallon bucket. 16 buckets later, sure as shoot, 80 gallons!! proven method of measure
I would ask them to waive dealer prep, pdi fees, etc. Try to get some upgrades like better batteries, hitch discount etc. I just purchased a 2018 Jayco Eagle @ CW in Kaysville and was able to negotiate an exceptional deal on a 2018 model. Good Luck
