I just returned from a 5,000 mile trip out West and while on the road had one of the long horizontal upper trim boards come loose from the kitchen slide of my '14 TS. Never completely fell, but one more good bump and it probably would have. Thank goodness the wife was sitting back there and saw it hanging down.
It partially dislodged the large center trim piece, but it didn't fall. As others have said, originally just some air nailer finishing nails held it all together. No evidence of any glue or construction adhesive. Doomed to fail on rough roads! I put everything back with ring shank finishing nails, hopefully those keep things in place. Now that I am home I will do the other side too to prevent what seems to be a somewhat common "flaw" in the construction of our units.
Don't you wish we could have put our own units together from the ground up? I think it most cases the engineering is sound, it is just the execution on the shop floor where things seem to go wrong.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST