Are you staying on-site? Sign up for DME as back up. No problem if you don't use it. Worse case scenario one person waits at MCO for the van or
Budget has to make arrangements to get it to you later.
The question is what happens if a customer returns a van late or a van has to be taken out of service for repair. I'd give the one available van to the passenger who's paying $1200. Sounds like you share my opinion.