I am partial to GM,but if it were a plow truck,I would seriously consider a Dodge.Dodge will not sag at all with its best in a pickup 5200GVWR front axle,the Dana 60 is the best front end now available for plowing.Dodge also turns on a dime and gives back change,very manueverable,much better than GM or Ford.A GM 2500HD has more payload,but its in the rear,we hang plows on the front,so its still going to sag out if you have the diesel or big block.If it were your only truck Id live with the sag and buy a GM,base 6.0 is very strong.I wouldnt buy a Ford,only because they are difficult to service and havent had good luck with them,others have had great luck-I just know you should buy a 2500HD as the minimum,and get plow prep,trailer tow and aux battery if you buy one.The plow is easy-get a Fisher EZV 8.5. Strong,and easy to get parts for.Do not buy a diesel if its parked to far from power,they need to be plugged in when it gets below 0.,I plug in at 25 and below,they just start and run so much better that way.