A van I'm interested in buying is priced lower than expected - should I get an RAC inspection done?

I'm looking at buying a van and have narrowed it down to either a Ford Transit Custom or Mercedes-Benz Vito, on a 13-plate with good options. I want it to tow my caravan, but I've been told the Vito sits...

What's the best Ford Transit to tow a caravan with?

Can you recommend the best Ford Transit variant to tow a caravan weighing up to 2000kg on long European journeys? It would ideally be a short wheelbase version and either a panel van or double cab van...