The dry weight is not the number you want to use. You need to get the information fro m the manufacturers weight sticker that is inside the cabinet. This is supposed to be what the RV weighed when it left the factory. Dry weight does not include any optional accessories.
By the way, welcome to iRV2.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot