Whatever you do, don’t buy a used Gulfstream.
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Not sure this is true for all of them but you could substitute a lot of names for Gulfstream in that sentence...
I also own an older “Coachmen” motor home, and not only is it more reliable, it is much more straightforward to repair when something does fail...... Well, other than a pesky roof leak that took even my professional roofer buddy several times to figure out and fix.