G'day mate.
Pretty mch anything has been done as 'field expedient' mods, but toconvert a Cargo to FFR is no small thing.
Alternater and loom, batteries and racks, and radio mount racks in the rear!
Most commom was simply a sig, a HF radio, a few spare batteries and antenna pack.
This is what I carried for years (in and out of vehicles) and was more than capable once you knew your stuff.
Comms from 100m out to 2000km and more.
Do you have some strange holes in the rear tub?
Cheers, dave.