you do not mean to flame me.....What does that mean?
RV coolant is conductive and will rob HF. Automotive anti-freeze is not only conductive but the additives in it will attack copper. Everything in a tig system is copper. If you do not have to worry about freezing temps just use distilled water, if you are to worry about freezing temps you should really use a low conductivity coolant, just make sure it it designed for Tig.