Yup - built brackets myself and then bolted in on with KC Locking M8 nuts to provide a degree of anti-tamper protection:
KC HiLites 7222 Light Lock (; M8 Set), 1 Pack
Discovered that when you have A/C on full blast and you make or recieve a phone call, the fan speed drops automatically to reduce background noise. Didn't know that....?
For my RTT setup, 2 x 100ah SLA batteries, 100W solar panel, VSR + external mains charging port.
It's enough for me to run a fridge, lights and coffee machine for 48hrs without any one of the three forms of charging...
@Bill I mounted my cross rails upside down so I can use the t slots from 'inside' the bed area. Works great for attaching large flat objects like a camping table...