[JRTJH]

Steve,

If you have a 30 amp "main breaker" and you have plugged your shore power cable into a 30 amp plug, then yes, you're limited to 30 amps. Even if you plug your shore cable into a 50 amp plug, your RV "main breaker" will limit power to the RV to 30 amps. Anything that draws over 30 amps "should" trip the main breaker.

Remember that all the "RV exterior" plugs are limited by that same "main breaker" so regardless of "where on the RV" you plug an appliance, your total for the entire RV (everything supplied by the 30 amp shore power cable) is limited to 30 amps.

If you want additional power above the 30 amps, you'd have to plug an extension cord into another plug somewhere on the house or the power post to get above the 30 amps. That extra power would NOT be a part of the 30 amp RV supply.