I got stuck in said Nolans Brook and had water upto 1" below the top of the seat box. You can't always rely on a bow wave.
I sealed the drivers side seat box with silicone I found in the shed and it stayed dry inside. I didn't seal the passenger side fully as it has breathers for the batteries.
A good way to find the gaps is park in a dark spot, and place a light underneath your truck. Remove plastic cover below.
The light comes thru all the openings.
HTH
John D - Defender 110 2.4

