Check date of manufacture of original van, carefully. My MH is on a 54 plate, but the van bit was built in 2003; so now 6 years old and is a Fiat Ducato with 2.3JTD engine. Had the belt changed yesterday while MoT and annual service was done, now have to pay fairly hefty bill on credit card in a few weeks!!!
The belt looked OK although shiny with some wear, but the tensioner was picking up material from the back of the belt; so I am satisfied that it needed changing. Better to pay out now, than break down with an expensive repair to face, especially if in Europe.