You can caulk if you so choose. We have had several RV's and none have been caulked from the factory. I caulked the last coach this one no. I had to reapply caulk every couple seasons. The walls lap the pan and I suppose the mfgr logic is that the walls and pan move when the coach is rolling down the road. actually I suspect it's just a cost savings on their part however.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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