The airbags prevent excess squat but shouldn't require changing the hitch height. Are you having the trailer lifted to match the height of the truck? You need to do this or your breakover angle will be very limited and the rear axle of the trailer will be very heavily loaded.
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2011 F-350 C.C. 4X4 LWB 6.7PSD
2010 Montana Mountaineer 345DBQ
2005 F150 FX4
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