My 2006 has 62000 miles and has given me absolutely no trouble whatsoever. I am considering reting a travel trailer to try camping with the family, so I have a few things to do with the truck. I will order a Tekonsha P3 brake controller, and a set of towing mirrors. I read through the owners manual and it states that I don't have to do anything with the rear gear oil or tranny fluid unless I am using the truck under "special driving conditions" which includes towing. I have never towed anything with this truck, so to this point, I haven't done any of that maintenance. Tires and brakes are good. The trip we are planning is about 225 miles each way. I have done plenty of towing boats, but never a travel trailer. Truck has the towing package with tranny cooler. Do I need to change the tranny fluid and rear gear oil prior to the trip or should I just do it after? Anything else I am missing? Thanks in advance!