Did you call or email the Customer Service people? Phone calls work better.
I would clean the area thoroughly and then use a urethane caulk and run a bead over the area. I don't believe that this area is going to leak or give you any problems but if the caulk gives you piece of mind, then use it. Urethane caulk is rated for 50 years and is quite a bit more expensive than regular caulk but you should be able to find it at your home center.
Roger & Mary
2017 Winnebago Navion 24V
2014 Tiffin Phaeton 36GH (Sold)