Re: How long do you keep your SMB?
Personally, I have about ten years of modifications left to do to mine before it's "right"... maybe by then I'll be ready for another one. My wife and I talk about campground hosting when retired and towing the SMB behind a behemoth Class A, so I guess we're in for the long haul.
As much as this van means to me, I've considered selling it, economy and whatnot, it's hard to look at an expensive luxury item we don't use nearly enough- still, what it's for and when we use it are priceless times spent, most often part of the short time we get with family.
I did spend years between vans trying to make tents, my pickup truck and truck caps work but nothing was ever the same as being in a van, SMB or not.