That is something that I hadn't though of until now and did make a big difference to mine both in hardtop form and now its station wagon configuration. On the floor of the rear load area (and second row foot well in the station wagon) I have 12mm...

In mine I fitted. Standard land rover under bonnet sound insulation. Standard landrover rocker cover sound cover. I used flashing tape rather than proper foil sound mat. In the cab floor bulkhead and roof. The complete shaped rubber floor rubber...