Glass is a no-go. The only thing holding the rear glass is old butyl.
I posted my rack on FB, and it has a thread here too somewhere.
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Aren't the front AND rear trunks enough? I have yet to make a long distance run, but it would seem to me if not, perhaps you have too much junk
When you start traveling in the 914 with a partner, and you are bringing tents, a cooler, folding chairs, etc. it is helpful to have more storage space.
2 people, camping gear, bikes, fresh clothes etc, cooler, spare tire, minimal tool set. Every inch of the car was packed. It was heavy. It was not as much fun to drive. But it went several hundred miles like this without issue.
but camping with these guys and biking all over town for a long weekend was worth it. These kind of events are what prompted me to start restoring a bus. For doing multi-day camp outs with a 914 can be challenging - everything has to be kept small - almost like backpacking. Except I'm not a teenager anymore and we want a few creature comforts when we are camping. You can (and we do do it) in a 914, but more storage is better.
Zach