Tim, I wouldn't stress out if the telescope you choose does not come with a 10:1 focuser, but if it does, bonus! All it means is that the focuser has both a fine and course adjustment.
for a reference, a 12" GSO Dob will just fit across the back of a VT Commodore, resting on the door arm rest. I know you may not have this vehicle, but I always use this as a reference. A 12" is starting to get in the "not so portable" range of scopes. I would recommend a Telrad, however. In my opinion, the best telescope invention of all time.
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