If your camper engine blew there's only a few reasons why..and it's not that its been used and abused..
1- you haven't checked the oil yet...tinny sound...bang. Head gasket blows..
2- Radiator overheats (places like australia), engine overheats, it goes bang.
3- you're thrashing it, it's only an oldmobile and can only do 50mph..but you want 100!..bang