Start of an Adventure with an S & S 8SC

So I we had a heavy rain last night and I went to check the camper out to see where there was water and what was high and dry. Had water in the middle of the main floor which was odd as I have no idea where it came from, Under the sink area is soaked which is a known problem area. and i walked under the overhang and just at random hit the uderside gently with my fist feeling for solid wood and heard water so I jacked the opposite corner up and lowered the LF jack slightly so it angled to the front and side and pulled out the trim screws and I guess I shouldhn't have been surprised but none were even attached to anything, most pulled out with my fingers and they are a newer type construction screw so obviously someone was trying to grab something further in than the OEM screws were supposed to. Anyways I know I have to pull the skin off on the front, the front windows and the entire left side and likely the rear and will most likely end up doing the roof to wrap it up but What is under the over hang for framing. Only reason I ask is the Wife & I have 1 last trip planned about 2 hrs away next weekend and i just want to make sure I'm not going to rip the thing apart either driving down or sleeping up there. from what I can tell there are some solid studs on the underside and really the worst is relegated to the far side and the closest stud to the left side otherwise the right side and every other stud is very solid. Do the "studs" run front to back or side to side on these S&S units?