Looking at the Vista 30T carrying capacity...seems from what I can tell, it is 2700 lbs. The dry weight is 15,300 lbs. GVWR is spec'd at 18000 lbs. Gas tank is 80 gallon. Water is 75 gallons. ...
You might want to read this recent post on CCC Fortunately you are only looking as compared to those that post I bought. Why buy something that is marginal at best.