Our unit unfortunately is 30 amp also. When we purchased it I went with the optional 15k unit and am glad I did. While it's an 11% increase it does help. The temperature is manageable but requires diligence in keeping doors closed, windows with direct sun blocked with an extra cover (we use a dark towel).
With a 30 amp shore power I doubt the vent roof vent will be blocked to support a second a/c unit. Several reports of members using the "portable room" units report successful results in high heat areas. For us, we don't go very deep in the south in the summer but schedule those trips for more temperate months of spring and fall.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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