1) I have monroe GT gas front strut inserts and kyb rear shocks, they are fine for me but generally you can stiifen it up with lowered springs and swaybars etc a bit more. I am still running standard ride height springs just heavy duty, lot better tahn before still pretty soft though.
2)??????¿
3) you can get sway bars off the tt142 but i am not sure whether they fit the rt142 maybe only the st141's
4)???????????