Check the weaght capacity on the axle and tires for single vs duals. A single simply can't support as much as the duals. If you are carrying heavy loads (big camper in back) or a lot of pin weight such as a 5th wheel trailer you need the dually.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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