You might want to try and kitbash or scratch build a generator for any one of the M-34 through M900 series trucks available out there..Try Scale Equipment Limited, they make a great line of 1/24//1/25 scale auto acessories and used to have generators,, depending on the type of generator you are looking for. Also might want to check out the Italeri field repair kit for all sort of goodies to go with the truck..