You should check your caulking, top to bottom, front to back at least once a year and touch up where needed. Water intrusion is an RV's worst enemy and this is what sounds like your problem is. The shaking they get while in transit tends to loosen things up, like caulking.
2012 Cruiser Sahara 330SS
2015 F250 Super Duty diesel
If it is inconvenient for you to check all the seals and caulking, for a fee, most rv service centers can do it for you. Don't know how much, but for a person who just purchased a used rv, it might be worth the cost.
Mark & Susan
'13 Cruiser Patriot 335SS - '13 Ford F150 SCREW - PullRite Superslide - Roadmaster Active Suspension Member - "Northeast Adventures RV Rally Group" & "Mason-Dixon Bunch"
my 11' slingshot has a wave in the front fibrglass where it meets the diamond plating. The previous owner said it was like that when he bought it brand new which I tend to believe since many pictures on google show similar problems with them on the lot. My local dealer said I should bring it in and have the seem checked at the very least to make sure its sealed properly. He also said the fiberglass was glued to something else behind it and they can naturally come apart even without water intrusion. So it may not be a water problem but best to get it checked out before it turns into a disaster.
LLoyd -- I check my seals every few months and apply some Dicor where needed, including along the cap seam. Are you saying for the cap seal, Eterna-bond tape should be used as a preventative measure or only if there is a problem? I also have the Eterna-bond tape, but have that on hand in case of emergencies.
Toyota Tundra 2014 CM 5.7L
Sunset Trail 2014 ST270BH
I went over the front seam on mine with eterna bond tape a few years back.
That seems to be a good area for water intrusion to start. Plus at that time there was talk of the roof membrane coming lose and tearing back.
I don't have to be quite so vigilant now.
For anybody that does this, make sure you clean it good, go slow with putting the tape down. Because it won't come back up if you screw it up. Also roll it out/down to make sure the air is squeezed out and there is a good seal.
2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow