Check the chassis GVWR and GCWR and them weigh the rig loaded as for a normal trip.
GCWR - loaded RV = Max loaded trailer weight
GVWR - loaded RV = max trailer tongue weight.
When loaded and trailer hitched, you should not exceed the the RV's rear axle GAWR.
And if you are OK on these ratings, the maximum trailer is 5000# when loaded.
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