2007 Greyhawk solar install

[WPnorton]

I just finished a Grueling 600w solar panel, lithium battery and 3K inverter charger upgrade. All the batteries are now under the bed. Now, all the stuff I had under the bed is displaced. The area under the coach besides the generator is now free space. Has anyone ever mounted a weathertight tool box to the frame in that spot? It seems like a viable proposition.