What are most common greenhorn mistakes?

I didn't see it listed, but re-torque lugs on the fiver before hitting the road. I use 100 lb-ft. My brother had a wheel come off and hit another car. Luckily, no one was injured. But it could have been a disaster.

Also, if you have slide-locks (to prevent slides from opening), make sure they're installed. You don't want your slide opening while traveling down the highway.