Starting with the 2011 model year, a E450 has a 22000lb CGWR, and with a 14500lb GVWR, in theory at least, the rig has a 7500lb towing capacity.
Of course this is degraded by most RV mfgs to 5000lb. Whether this is due to extending the coach, a liability safety net, or simply just because they are cheap and only install a 5000lb receiver, it at least tells me the tires, suspension, engine, transmission, etc are capable of towing more than 5000lbs.
While I am a conservative tower, my 3000LB car is less than 50% of the "theoretical" towing capacity.
It would not bother me at all to tow up to 4000lb and still be within my conservative comfort zone.
Of course, an older E450 (with a 20000lb CGWR), or a E350, or Chevy rig... adjust accordingly.
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