Sweet, will definitely look into some 5k 30C packs, they'll fit the Rusty tray with a little Dremel work. Definitely getting excited over having my truck back, I'm building this one up very similar to my old one. Too bad Losi discontinued this truck, it's hands-down the toughest truck I've ever owned plus it handles very well and looks cool. Fortunately it shares many of its parts with the LST so I can keep it going for a long time to come.
EDIT:
Just came across this gem. It costs 2x what the Muggy mount costs and will involve some customizing to fit my chassis but that is just cool. Might be worth a slightly higher CoG to have a battery on each side to balance it out and not have a giant load of batteries hanging off one side like my old one. Anyone have any experience with this mount?