I have an 04 Vectra, big brother to your Journey. Had the same issue... new-to-me house has an RV garage with a 12' door (actual 12' - the door goes above the opening so I have the full 12' clearance.)
The two questions are what you have on the roof (vent shrouds etc) and aired up or down. Dennis comment about basement air probably was because that means we do not have roof air conditioners adding to the height.
To figure out my real height I took an 8' 2x4 up on the roof, figured out my highest point (my vent shrouds) and then laid the 2x4 on it level and measured to the ground.
I found I can pull in if aired down, but if aired up I cannot. My system has been to back up to the doorway and get the RV lined up straight to where I want to be, drop air, and then back in. I verified with Freightliner that backing up 50' or so while aired down will not hurt the coach. When pulling out, I have to idle just enough to hit the sweet spot where I can release the air brake but not start filling the air bags.
A bit of a pain, but the house came with the garage and I cannot modify the doors to be any higher. Oh well. Has worked for me for 10 years. In any case, get your own real measurements and go from there.
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Ed & Joie
2004 Vectra 40KD
Freightliner Chassis and Cummins ISC
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