Never installed one in my bay, but have used them plenty. MIG means metal inert gas and that implies a gas tank, there are 110 cu ft varieties and the small tanks. Either takes a lot of space. If you are only after the flux core wire capability, then no tank is needed. I have a 180 amp 110 MIG that I sometimes use with flux core wire but it needs a lot of amps. I think a 15 amp circuit might not work reliably. If you are after or have a smaller amp rating then maybe a 15 circuit might work. Ot sure what you mean by installed in the RV? Plugged into the RV circuits? If so be careful, do the math.