This link to images on Google -
https://www.google.ca/search?q=rear+...=lnms&tbm=isch - should give you some ideas.
I spent about the same as what roof air would have cost -
http://www.classbforum.com/forums/f8...oner-2051.html - I think. I wanted it to look as good as possible, if that's even possible.
I didn't want to loose the solar or give up the fan vent. Part of the metal roof is still in place on my van (it creates the storage at front and rear) & that meant additional ducting and losing storage. Anyway, that's how I ended up with an a/c where a window would be.
Roof air would be better for cooling. Better location & more BTU's.