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I got the idea from this Sawiko thing. https://www.sawiko.com/uk/rear-garage-loader-motorcycles The winch has a remote, so you stand back and the bike disappears into a fairly small cupboard in your camper. It's expensive to get it fitted, so I thought I'd do my own cheap version. The ramp needs rails and a pair of sliding chocks, which, in my daydreams, I knock up from something or other. I think there's enough detail in these videos to copy the idea:
https://www.youtube.com/watch?v=hWYm8vQorZY
https://www.youtube.com/watch?v=qYfRNpabXRo
But if you don't get it right, the bike's going to lean a little too far, and everything will be destroyed in a very spectacular fashion. So I'd have a safety strap attaching the bike to the top of the van.
Treat yourself to a winch to load bikes. I have. Not used it yet though. You can get portable ones which you can also use for recovery or pony play or whatever. I got one of these on ebay for £40 https://www.rapidonline.com/sealey-pw1360-portable-winch-1360kg-line-pull-12v-89-9186
£275 rrp. New, but never used, from someone like me who had a idea but never finished it.