HB GT10 / LS10 Mods Upgrades Alternate Parts

You guys seem to know a lot about the Lightning trucks. I have a Lightning GT10 Sport myself and i have a few problems with it. I already lost a dogbone twice. The first time is was explicable because I broke the upright. But the second time the upright was OK. I was driving it and I realized that the rear wheels weren't driven. When I inspected it the dogbone was gone. The replacement part was exactly the same as the original.

The second problem is that the steering servo can hardly handle the wheels. Is it possible to add a second servo or is it better to replace the servo by a stronger one?

Any help would be appreciated.