I think your sales rep is telling you to go check them out physical because the CCC is very dependent on too many variables. When we were buying our Itasca Impulse I couldn't find the CCC online at all, so I just had to wait and check out the sticker when we took delivery. Luckily we have about 2400lbs worth. But I think that included a full tank of gas and a full tank of water minus people, propane, grey/black tanks, or "stuff" i.e. gear.
I seem to remember something about wheelbase and some number. If the number was high then the weight was somewhat distributed evenly. Wish I could remember exactly where I found that but it's been a couple of years now.
2017 Thor Tuscany XTE 40BX
2011 Jeep Wrangler Unlimited
ReadyBrute Elite w/Surge Braking System Tow Bar