This doesn't look like something recent to me. I notice the concentric rings of staining where water has built up, then evaporated, then built up again. This puddle of water could have been there since 2011 - i.e. that part of the roof could have been almost continuously wet since then. Also, the brown staining implies that dirt had built up on that roof, so even in dry weather that build-up of mud would still keep the roof underneath wet.
Plus that open caulking looks awful (or rather the visible gaps in it). My caulking looked similar, but my camper has spent over 20 years in a wet climate. In the case of my camper water got in through the caulking and ruined the timber components of the roof below causing be to have to replace much of the roof timber. Is that new white caulk they have applied directly to the mud?
I can't believe this dealer wasn't aware this camper had water pooling on its roof. I bet they were really happy to move this on when someone came to look at it when the roof was covered in snow and couldn't be seen.
Steve.
