I can only suggest to give a second look to separate sway bar setup. Yes, the are making a lot of noise during turns, should be disengaged before back up, should be retightened frequently and so on. However, they are simple, cheap and they work by PREVENTING sway rather the by reacting to sway which already started and their action doesn't depend on hitch weight which may be affected by porpoising. I can keep my hitch as light as I want
My setup was recommended and performed by the top RV outfitter and he has only 2 types of hitches in his shop: Eaz Lift for most cases and Hensley for the most challenging setups.
The bigger problem may be very soft rear suspension of the Avalanche which is unable to control the heavier trailer.
I hope it will help.
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Gene.
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'16 Passport 2670 BH
'11 Mercedes ML 350 gas, Reinforced OEM hitch receiver,1000 lb Eaz-Lift with custom welded head, 2 sway control bars, Prodigy P2 - ALL SETUP by Canam RV, Ontario, Canada
TST 507 trailer TPMS
'13 Passport 2650 BH- traded in
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