I used my 14K Reese slider this last week. Only the second time I used it in three years. I bought it used for $150. Added universal rails for another hundred.
A good friend and I installed it. Last year after winterizing I stopped at the local RV dealer to pick up a small part on my way to the storage lot. Happened to be a busy day so I had to back out of the dealership. Wasn't good. Hit the corner of the cab with the fiver. Dang!!!!(Censored)
I now use the slider if there is any question at all of hitting the truck. I haven't gotten an estimate on the damage yet. Kind of afraid to.
Better to have a slider that not. You will kick yourself if you get into a situation where you need it and don't have it. As well as if you have it and fail to use it. Good luck, John