Caravan warrantees fall well short of those provided by car dealers and manufacturers. Consumer law may be the same, but the manner in which dealers have to comply vary. So, any dealer or mobile engineer can carry out a service. And are not likely to refuse as it is bread and butter income. But having warrantee work done can prove troublesome. This is because manufacturers pay a much reduced but agreed hourly rate. Meaning some dealers steer clear of warrantee work unless they have to do it as they were the seller. But often they do it reluctantly.
I think I am correct in saying that even dealers who are franchised to a particular manufacturer, are not compelled to undertake warrantee work on vans they did not supply. Unlike car dealers.
(I may be wrong on that, it has been known).
Regarding servicing, selling dealers can sometimes be persuaded to provide 2 or 3 years free servicing to sweeten a sale.
John