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I am in need of a dually and am wondering if anyone has any experience pulling an enclosed 4 place snowmobile trailer in the winter with a dually. I generally only make 1-2 trips out west each year and currently haul with a ram 2500.
As far as traction goes on hard, smooth surface like ice or really packed snow the two extra wheels in the back should not affect traction. If they do it is a tire/weight problem not an extra wheel problem. Friction force = Normal force*friction coefficient and is independent of surface area. My dad's 9,000# F450 with winter tires is pretty nice to drive in slick road conditions.
Deep snow is more of a challenge for traction apples to apples dually to srw.
Moreso is bad setup. Less guys run burly tires on duallies. Highway tires suck no matter what you're driving.
The other big thing is tire pressure. Same with srw trucks, except it's more of a hassle to adjust tire pressure. Too many people think you run the pressure that's on the sidewall. Drop pressures to where they should be for the load which is suprisingly low with 4 tires even carrying a couple thousand lb payload and watch your traction get ALOT better.