I
had a Highlift F350 and made a battery mod that should work with just about any RC battery. Let's see if I can remember though!
I installed a rectangular section of styrene that was about six inches long between the chassis rails, behind the transmission. I can't remember very well (4 years ago), but I think I removed a black plastic brace and used the existing holes to keep the new plate in place with the original kit screws. Wrap a section of Velcro around it to hold the battery in place and violá...a battery mod for the tallest
brick of a battery. I think I used one that was just that, a brick. It was a 5000mah LiMN, I think. [sm=50_50.gif]
.....so many RC, so few brain cells left. [&:]