Agreed with the tow rating. The brave has a 5,000 lb rating as well. However, given that all of the components are "beefier" for lack of a better word, I would think that it would handle the upper limits of the rating better than the class C based on the E-450.
You might also look at Thor. They are making a Super C based on the F-550 truck chassis with the 6.7 powerstroke. Physically it is not really bigger than a standard C, but it is rated at 10,000 lbs. sorry I didn't mention it before, but I just remembered. They have some rebates for 2014s going on too. Might be worth checking out.