[400TT]

We've always glued the floor carpet to marine ply boards that can be removed to dry out if it gets wet. Also makes it easy to clean. They've always been professionally trimmed in carpet with vinyl edging, heel pad etc.

And as above, always have drain holes, you can buy little covers(I think marine ones, covered front, open back) that stop the water splashing into the drain holes...handy when your travelling through really, really heavy rain.