Re: unidentified camper van
It does look Xplorer-like, but the rear single side door and rear window configuration
aren't quite a match to anything I saw on any Xplorers.
Looks like the rear left side swing door (if there is one?) has been used to
back something inside the van (maybe galley equipment?) and may be permanently fixed closed.
I'm leaning towards homemade/DIY.
It's not a sprint(er) (unless you make it one), it's (hopefully) a marathon.
RV - 2018 Navion 24V + 2016 Wrangler JKU