The water in my bed is just drops, not a pool. Sort of looks like the bed rail in my pictures. A day of no rain and warm to hot weather usually dries it out. Living in the Pacific Northwest, I'll need to watch it much closer now as the rainy season is about to start.
If you have pools of water, then yeah I'd try to beef up the weather-stripping to reduce the amount of water getting into the bed. Looks like you have the spray in liner, that will go a long way to preventing moisture issues. I have the factory spray in liner and a rubber bed mat in mine. I'll probably check it once a week and manually dry it out if the water starts to accumulate.
If you have pools of water, then yeah I'd try to beef up the weather-stripping to reduce the amount of water getting into the bed. Looks like you have the spray in liner, that will go a long way to preventing moisture issues. I have the factory spray in liner and a rubber bed mat in mine. I'll probably check it once a week and manually dry it out if the water starts to accumulate.