Hi guys, completely forgot to report
Well, the trip went well, i was worried a lot about the tranny overheating, motor not being powerful enough, suspension being too soft etc....
None of these issues really surfaced besides the truck sagging a little in the rear. I did have an extra leaf put in, and installed the recommended transmission cooler(thanks etrailer.com!!!! great product and service) before the trip.
Truck did great, on some of the hills it did slow down, but not to the point where i felt i was pushing it too much. We did close to 55mp/h throughout the whole 1100km trip.
I must admit that the 4.8 with 3.43 ratio did really good. The only thing i missed was braking with the engine when in tow mode. My 2008 2500HD does it, apparently 1500 don't.
The only hickup that i had was my brand new Tekonsha P3 controller. I could not get that damn thing to work properly! Tried different settings for trailer sizes, boost, etc... and either it would brake just a littlebit at the beginning of braking and a little more at the end, but i felt my truck was doing most of the work, OR when larger trailer selected and less or more boost it would brake OK the way i wanted it, and then at stop it would almost lockup the wheels and my trailer was jerking. At this point im thinking that i should have left my manual/slide brake controller and regret buying the Tekonsha. Anyone else with similar problems before i make a thread out of it?
BTW i did not have a WdH or sway bars and it pulled fine with wind and semis.