This has nothing to do with rear wheel numbers and everything to do with tow vehicle wheel base. A 190" wheel base SRW will pull a bumper pull trailer better than a 100" DRW because of leverage and of course a 200" wheel base with tag and super singles would be the "perfect tow vehicle" right? By the way Harvey and Griz many truckers today are steering wheel holders not drivers. To many cell phones, dvd players, drugs and hiring people who just don't care.
Fred
Fred