I have since ordered a set of four 17.5 rims (Hi-Spec Series 3) and a set of Goodyear G114's to go with them. Tires are 215/75/R17.5 rated for 4850 lbs. ordered everything from Trailertireandwheel.com.
Should be here next week.
2013 Ram Longhorn 3500 Crew Cab 6.7 Turbo Diesel, Aisin Transmission.
2014 Jayco Eagle Premier 351 RSTS, Mor/Ryde Suspension and Pin Box, 17.5" wheel upgrade, 18k Pull Rite hitch.