I could only use 1000 characters and it cut me off.
My 04 is a bit easier to use, so your 06 should be great. You won't have a ECT button, so don't worry about that. To put your car out of overdrive, go to 4th gear. That gear is 1:1. You will fine that out on the highway, you may want to use 5th gear and it should do fine. When you slow down or are in the city, use 4th gear. I do not have a transmision cooler. I would use that if I towed over 3,500 pounds. I do use synthetic oil in my engine. I figured that would give it better protection from the heat.
The camper is a Jayco 10X and we love the layout. The only thing missing is a bathroom. Parking can be tricky, if you want to eat at McDonalds, you may have to park a little bit away, in other restaurants you park in two spots. My camper has air conditioning and we went out to Yellowstone in June 2005. The first day we got there, it snowed. It also had heat, which we used all the time and we never used the air.