The other solution instead of a roll bar might be a wing. I haven't beaten on this wing seriously yet so I don't know how well it stands up but the combination of the wheelie bar, wing and metal plate stiffening the rear shock tower I think my esc might be OK. Also mounting the shocks on the front of the rear shock tower helps stop the tower flexing inwards.
I still would like to get the roll bar on but it's not going to happen until I get a new servo and a metal servo horn.
Savage: FLM Conversion, 6s, MMM, CC 1520.
Mini-T Pro: Micro Pro 6800kv, Lipo, HS-81mg, Dirt Hawgs
M18MT: Quark 33A, Y22S 6000kv, FP 2s Lipo
LRP S8-BX: RC-M Conversion, Tekin RX8 B1600KV, 6S.