Front center cvd's break, but there is no aftermarket alternative.
Millzee and auto2 both have the rcm kit and say 8s is plenty.
They are solid trucks. I don't own one but have been following the Losi5forum closely since the truck came out.
The biggest complaint is steering servos. There are a couple dual servo kits available, otherwise people are using the savox fifth scale servo.
It's solid stock, but of course FLM goodies are always a good choice.
Git 'r dun.