Replace truck back window so it opens?

[Bad Habit]

In the 2+ years that we've had our camper, we have never even taken the cover off of that window. I've had the rear slider open on this truck and the one before it combined maybe a total of 3 times, mostly because I hit the button by mistake. Yes, it could be used if the keys get locked in, but the truck window will probably be closed anyway. I agree, if you don't have now, probably not worth the expense to add