candace

Hi Candace, my son is in commercial building.  He says his window contractors on high rise structures swear by Dow Corning 795 because of it's tremendous flexibility, important issue because Toys bounce and sway during movement.  Google it in and check out it's qualities.  It is easy to work with but takes 7-14 days to fully cure.  It is rain resistant immediately upon application.  He gave me a tube left over from one of his jobs and I have used it to seal all my running lights with good results and no leaks. As with all sealants, make sure the area is very clean prior to application. Lastly, the pics. you provided . Is one of  them the ladder attaching to the roof and near the vent pipe? I would seriously consider removing the screws, thoroughly cleaning the area to the metal and cover with Eternabond.  I would then re-fasten it to the roof with screws.  I believe these areas are your culprits.  I had the same leak problem around a vent pipe with just a tiny crack.  Believe me a tiny crack/hole will result in a lot of water entering the cabin and causing damage.  I believe you can buy 795 at Lowe's. Good luck with the leaks.....I have had my share!