Alright...so in 6 says we start driving from Maine to Prince Rupert, BC...today we bought a new (to us) cap. Unfortunately it does not have a sliding window to access it from the cab (we have a dog). Or old cap has the slider...any body every change the glass on their caps? I don't have too much time to mess around with it. The new cap doesn't leak (yeah!) so I am hesitant to just start cutting holes in the glass. Any thoughts on who could change glass in these? Any help would be appreciated.

Old cap: Travacap
New (er) cap: Gazelle