Its a brave (or foolish) person who'd expect anything decent for that money.
I've owned a MURVI Morello based on a Ducato LWB 2.8 JTD since 2007. The build year was 2003.
Unless you constantly check and re-check all the systems, things can and do go wrong.
It is, after all, a house in miniature, but subject to all the internal structures like electrics and plumbing being shaken about by the road surfaces you'll encounter during the mileage you drive.
In addition, you've got to remember that despite the excellent quality of the internal habitation build by the company, the whole package is based on a bog-standard commercial van.
These vans are built and designed to be driven into the ground and be worthless commercially after 3-4 years. Consequently the manufacturers don't bother too much about access for complex servicing and rust-proofing. All this is problematic for us who want to keep and cherish our mobile homes for many years, especially if one's on a budget and can't afford to trade up every 2 years or so.
My reading of the posts here however, make me thank my lucky stars that I have a relatively unsophisticated 2003 2.8JTD rather than anything newer with all the complications in engine managment systems, electrics and emission equipment problems.