I think you removed the rear chassis brace to fit your electronics, right ?
I don't think thats a good idea.
This leaves the rear (where the chassis is most fragile) unsupported.
Don't know what other people think about this, but I wouldn't do it.

Nice truck btw.

Is that a 3 cell 4300mah you are using ? Where did you get it ?
Are those Asso 12th scale servo mounts ?