When considering purchasing an RV, forget about dry weight unless that is how you plan to travel. Focus on gross vehicle weight rating and cargo carrying capacity. To find the hitch weight of a fully-loaded trailer, this is when you use the published dry weight and hitch weight. Calculate that percentage of hitch weight, then multiply the fully loaded weight by that percentage. It will not be completely accurate because how you load the trailer affects hitch weight.
I recommend using this online towing weight calculator. It is accurate, impartial, and removes salesmens hype from the decision.
https://changingears.com/weight-calculators/
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln