Apparently the fasteners that keep the two panels together have broken, or pulled out of whatever they are screwed into. If you remove the corner molding (on my TM it is just glued on with caulk), you should be able to see what is going on. If you don't like what you see, The Car Show may be the next step, but I bet you will be able to fix it easier than that.
You are quite right, the immediate priority is to keep water out of the wall. I think your plan to use tape to cover the gap while you go to Estes Park is probably OK, provided that you stop and check the tape every little while, and that you don't drive in pounding rain. Driving may pull the tape loose, so be prepared with more tape when you reach the campground.
It sounds like you are adjusting the corner latches way too tight. Remember, when you pull down on the latch, you are pulling the side panel down. At the same time, the front panel can't move down to match it, because it is resting on the rubber blocks on the frame. So all the stress is concentrated on the fasteners between the two panels - and this appears to be what is shown in the second picture.
Just my thoughts.
Bill
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