I'm sitting on 40" tires with a 12" lift on an '07 2500 HD Crew cab with the duramax 6.6 and the Allison tranny. Tow a 29 footer that weighs about 6800lbs loaded and can hardly tell its there. I'm sure your 44" tires weigh alot more than my 40's but I really dont know about towing........especially if your towing back and forth to the river. Have you re-geared?