Might want to check to see how much that RV weighs. Some of those Class B RVs are heavy! Add the weight of the personal gear you want to haul and see how close you are the van's gross vehicle weight. Since it is only a B250, the trailers tongue weight could be a problem.

When you check to see if it is a 5 or 8 lug, also look at the rear end. I believe Dodge used some 8 lug 9 1/4 inch rear axles in some vans. If so, these 8 lug, 9 1/4 Mopar axles are not as strong as the Dana 60 axles.