There is an Outlaw 29H Class C (E450) owner here on iRV2 that tows a 7,000lb load and reported it is no problem.
http://www.irv2.com/forums/f121/outl...ml#post3401986
The catch is that the Class C selected must have the right "outfit."
That means a receiver hitch rated at over the towed loads weight (i.e. TMC Class C's -FourWinds/Chateau/Outlaw have a 8,000lb receiver).
Then you must load the RV so the combined loaded weight (loaded RV & Towed) does not put the combined vehicles weight over the E450's 22,000lb GCWR.
This should be totally NO PROBLEM since the E450's GVWR is 14,500lb - so technically there ALWAYS 7,500LB (22,000lb - 14,500lb = 7,500lb for towed load) towing capacity available - just check your weights loaded.
But - Warning going over GCWR can cause overheating, transmission damage, and a general unsafe on-road situation.
AND - For your Jeep...The Jeep must have a supplemental brake system. Please do not forego brakes on the Jeep.
Best luck