I carried my NCB over no problem, but I would suggest a bigger van, mine’s an old Vito, if you are going to. Mine has windows and seats, but the back is panelled.
I’ve rarely been asked to move people, but it’s great to help sometimes.
MPG may be an issue, I don’t do a lot of miles nowadays, and if you have no windows in the back at all you will get charged commercial rates on toll bridges & roads, i.e. Severn bridge. Mine is registered as LGV, so my speed limits are slightly reduced, which I only found out after the speeding ticket on a dual carriageway 🙁
Otherwise it’s all good, I won’t be going back to a car anytime soon.