Carb Cleaner wrote:
The Chevy has more towing capacity because of the leverage effect on the Ford and Ram
Actually the Ford vans have the highest tow ratings. Chevy "max tow" numbers come close because they do the math different, but the GCWRs of the Ford vans are higher. Diesel = 20,000 pounds and V10 = 18,500 with 4.10 gears.
The 6.0 Chevy tops out at 16,000 pounds. The DuraMax vans get a bump to 17,000 but they weight 500 pounds more.
I have towed with both extended Ford and Chevy vans. The Ford vans handle the weight better. While the Chevy van has a loner wheelbase, it also has softer and narrower leaf springs, which allows the rear end to get pushed around more. Plus, the Ford vans have much bigger brakes and a much more robust cooling system.
The Chevy vans have a more car-like steering feel to them (stronger steering center) and they ride better lightly loaded. Also, its much easier finding used 6.0 Chevy vans than it is V10 Ford vans, at least when looking at used passenger vans.