Ofna MBX or 9.5 rear shocks should fit, and the failsafe is definately worth investing in and it'll save you- it has for me, it has a certain cut-off point when the battery gets low, not low enough to shut off but enough juice for the failsafe to work. If the battery gets disconnected, well your fault for not securing the wires. 
As for scale, I'm still baffled of WHY Traxxes put the T-Maxx in the 1/10 scale when 95% of other MTs (of the same size) are 1/8, but then again the T-Maxx doesn't run a .21.
As for scale, I'm still baffled of WHY Traxxes put the T-Maxx in the 1/10 scale when 95% of other MTs (of the same size) are 1/8, but then again the T-Maxx doesn't run a .21.