The reason they say you cant tow with a commercial vehicle is due the the rear suspension being to hard, Meaning that your van could shake appart if you were worried about this happening you could fit softer rear springs.
The kombi may well have softer rear sping fitted ?? vans usually have firm springs as they carry loads of weight, as this is part van part people carrier i may be ok
Get it serviced at home by an approved mobile workshop & keep your warranty intact, its better than unloading the van taking it miles for a more expensive service anyway
I spoke to Bailey about this issue as perhaps a Ranger would be the most suitable tow car for us considering the junk we generally take away & they said it would not be a problem & our warranty would not be effected. Check with Swift, they may be the same.
My guess is the clause is in there to exclude warranty claims where the caravan is in permanent use and towed from field to field by Transits for instance........
Re servicing, I've never had to empty my van for services, perhaps I'm lucky with my local service agent.
I use a Peugeot Boxer van to tow with and only found out about the invalidation after purchasing the caravan and reading the warranty after.
I even mentioned the tow vehicle to the dealer when enquiring about the van prior to purchase and all I got was "that will tow it - no problem"
Nothing was said when I towed the van away when it was delivered to the dealers, or when it was returned for warranty work !
I guess if the cupboards were coming away from the walls and the like, it would be another story.
Most manufacturers now do a passenger model of vans which are sold as cars so i think most caravan manufacturers would be realistic with a modern vehicle. however, I would confirm with the caravan manufacturer that it is ok as it's will be easier to get confirmation before any issues may come to light