Two things I would suggest.
Only caulk the outside. If you caulk the inside and the outside is still leaking, the water may just stay in the walls. Leave the inside alone so you can tell if it the outside is still leaking.
Do not use silicone. Use a regular caulk or RV specific caulk.
Nothing will stick to silicone, so if you have to caulk again in the future it will be a problem.
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Dan
2014 Berkshire 390RB-60
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