Best one yet - get a 1/8 scale buggy.
All serious though - You want RPM A-Arms - aluminum bulk heads, bulk head braces and bumper mounts and either RPM bumpers or aluminum bumper.
Most parts are same for R or T-Maxx so - These are hop-ups I put on my wife's TMaxx -
Aluminum - bulk heads, rear bumper, bulk heads and bulk head braces, bumper mounts
RPM - A-Arms, front bumper, body mounts, shock towers
Fantom 18 Engine (Not broke in yet)
Few other things but can't remember without looking at the truck.