Are you talking about the customers door?
Ummm, commercial sized door stop.
As for the barn doors on the side of the van, one has a stopper.. other I bungee to the wheel well of the rear tire.
Reread,, the van.. Blowing open? Don't ya want them open to let the TM breathe?
Otherwise if you run a
CDS etc.. then just cut a trap door for the hoses.. close and lock the van.