After looking at your trailer model online I would go with Class E just to be safe. Donn is right that the Maxxis tires are the best. You can find them at Discount Tire Stores. Camping World carries Goodyear Marathons. They are a better tire than in the past but the Maxxis are still better. They will be more expensive as well.
Philip, DW, 3 DD, 1 DS, and Kadie our Dog
2013 Flagstaff V-Lite 30WTBS
2003 Ford Expedition 5.4 Liter with 3.73 Axle
Equalizer 4-Point Sway 12000# & Tekonsha P3
48 Days of Camping Reserved for 2012