Wiring one air conditioner to use 20 amp outlet

Please don't give the OP wrong information. Winnebagos are NOT wired like trailers or other RVs. Winnis contain a selector switch that selects between front and rear A/Cs. By connecting a cord off the 2nd A/C can cause a short and fire, even with a switch separating them. OP, download the wiring diagrams for your Brave and study how the selector switch is wired before making any changes to the wiring. If wired up wrong it will cause either a direct short or voltage crossover.