I pulled my puma 25FBC with my 04 z71 surburban with similar equipment as yours. It struggled maintaining speed on any incline, often shifting down to second. I figured at some point the flywheel would depart through the hood. To be fair it pulled it good in side wind or around trucks. No weaving or tail wagging, but it was very underpowered. I went to a diesel truck and it is a lot more relaxed tow. I plan on a test pull with my son n law 16 Chevy 1/2 ton truck just for fun to see how much they have improved the power in the 5.3 since 03.