The reason many accessible spots like this had large clearance on both sides is so if the person in the vehicle needs extra space to get out. Many times they may have a lift or ramp that raises and lowers an accessibility scooter into and out of the side of the van and blocking this area stops them from accessing their equipment.
I paid for RIF with mine back in the day lol. Might do this now too
My setup is this:
So me, my partner, parnets, and friends when outside my network can go to jellyfin.domain.whatever and login to my jellyfin. No ports open to the internet except 80/443 on the reverse proxy, and no ips to remember. That will give you some things to google to get started to replicate a similar setup for your needs.