You aren't thinking about towing it with the Baystar in your profile, correct?
I believe a Spinter's curb weight is well over 7,000 lbs. and that's before anything is loaded into it so I'm pretty sure that it would exceed the Baystar's towing capacity. Are you thinking of upgrading to a big diesel pusher?
You might take a look at the Ford Transit or a Ram Promaster as I believe they might be a bit lighter but still may be too much for your Baystar.
Vans nowadays are mostly RWD so the driveline may have to be disconnected or a lube pump used.
There is a thread I once read on a Sprinter online forum that discussed flat towing and they used a lube pump. Personally, I don't like lube pumps so you might consider some way to disconnect the drive shaft.
Let me know if you want to the link to the post on that Sprinter forum. It was just a short post somebody made in that thread that said both he and his dad towed Sprinters. He used a Demco towbar and his dad used a Roadmaster and both used a transmission lube pump.
Here is a thread here at iRV2 on towing a Sprinter that's over 5 years old but might give you some insight ...he's using a disconnect --the thread is an interesting read: