Wow i dont know why a lift shop wouldnt want your busness. I used to work at a lift shop and we did Escalade Trucks there not much different from your normal Chevy. The floating could be many things. If anything under the truck is loose, or worn out. To tall of a body lift will do that also. Tall tires also don't help that feeling. I would deff check all the lift items to make sure there tight. If it is drifting get the stearing links, ball joints, and all that good stuff checked. Lift kits can be done wrong and cause allot of damage. You need to find a shop that actually wants to make money to take it back out for you.
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