Anyone tell me their pros and cons of towing 30 to 36 ft 5th wheel with a F250Srw? DAL vs a F350Sadr DAL. I've been told the only difference in the two is the rating of the front springs. Everything else is equal like? rear axle size, weight capacity etc,brakes and so forth -? any information on this I would appreciate hearing. If I were to install the airlift bags on the rear axle giving it an additional 2500 lb capacity as it claims ; would this make the f 250 SuperDuty in the SRW axle set up equal to or as safe as towing with the Dually??Thanks RV PaPa