Have mounted stumpy lipo sideways on chassis to get as much weight over rear wheels as possible without adding weight.
You have to dremel some of the side pods away to make it fit.
Also mounting it this way you cannot use the original shell, i use the ftw vane shell which has a lot more room on the side where the lipo connectors are positioned.
Ran it last sunday at
http://www.mercc.org.uk which is a grass/hard packed dirt track for the first time since only getting the car on the wednesday.
It handled superbly.
dads losi 22 003.jpg
dads losi 22 004.jpg