[sourdough]

With the 4.10 you will pull the hills fine, just spin some rpms if it's over 6 % or so. Use tow/haul for sure. Remember coming down to use the tranny to keep you going slower, don't let speed build up too much and DON'T just ride the brakes worrying you're going to go too fast. On a long downhill it's possible you could experience some fade depending on how well all the components are working and how you utilize them - you don't want that. I have never experienced that towing an RV but I watch my p's and q's. If you think you have overdone it and you've heated up the brakes too much there are usually pullouts on long steep grades....use one to let it cool off.