info needed on possible purchase

For a 30 foot rig in central Texas, especially one with slide-outs, a 15k A/C is borderline minimum. If we get 110+ degree summers, it will not be enough. Realistically, I'd look to go with a 50 amp rig, or one that had 30 amps, and a separate 20 amp circuit, so you have two 15K BTU air conditioners.

Don't forget to get a generator that can handle that. I'd consider a 6000 watt Honda or Yamaha generator, which would have enough power to overcome the locked rotor amps of both A/C compressors.