We have a 2001 Toyota Sequoia. We brought a 2012 Keystone Passport, dry weight is 6000. We don't go camping much and have pulled it over the West Virginia Mts to PA and also up to NC mts. That was a couple years ago and we are now afraid that the truck may be too old. Concerned we will burn the engine out. How do we know when not to use the truck and find something else to pull the trailer? Are there rental trucks for a one-time use to pull the trailer for a week?