I had a folding bike for awhile that broke down and fit under the bed of the van. The bike was great but took up a ton of storage space. My current whip is a vintage fixie that gets locked on the rear rack with a heavy chain/lock combo. I tend to know people where I travel so the bike can usually stay in someones house too. Locking my bike to the back of my van doesn't blow my stealth ability (I don't think) due to the fact that I have a conversion van and not a windowless cargo van, which I think would look out of place. If I have to leave the van unattended I just lock the bike inside behind the privacy curtain. I am thinking of getting a dinghy (a 50cc scooter) which will live full time on a rear motorcycle rack. That, I think, will blow my stealth ability. hope this helps.