What kind of caulking where roof meets sidewall?

APT wrote:
Eternabond should do well.

The OP isn't asking about repairing the roof but rather just out of interest what is used, the answer being one brand or another of polyurethane lap sealant such as Dicor, Proflex, Sikaflex, etc. From other posts the OP has made he's terrified of his new camper as it is, no need to further complicate it with answers like "Eternabond" which will probably confuse or even terrify him further. :R