Claus I wish their site worked so I could see some of the stuff they have. Don't know if I will need the aluminum case. I went with Tamiya crabon reinforced rear axle and tranny housing so that should be strong enough.
rctrucker2 you don't need the brass gears but I figured if I was making such a big order might as well give them a try. I don't plan on anything really heavy but you never know what the future might have. When I did the knight hauler it was all stock with the box trailer and stock motor and never had an issue with it and I know to this day it's still running without issue with the guy who owns it now. The drive shafts I found on eBay. Here's the links for you:
http://www.ebay.com/itm/1-14-rc-Truc...item2a3cad153f
http://www.ebay.com/itm/291136408718...84.m1439.l2649
On a side not got a pair of Rcmier fifth wheels in. Love the fact that the screws are hidden, makes it look a lot better.