We are currently towing a 2013 Passport elite 28bh with a Landrover LR3. We use a 4 point E-Qual-izer hitch and Prodigy brake controller.
It actually tows well but we are also safe and stay relatively close to home ...
It seems like it would be nice to have a little more power though. Wheelbase would be greater as well ....Finding a used Armada this way is near impossible , it seems.
And yes we are in the " salty place." Good point that I didn't really think about .....I am going to look at the 2004 again today for a closer inspection but I think we will just keep looking.