The only generator offered by Heartland in Landmark is the 5.5kw unit (
link). It will not run your entire coach. It will produce around 5500 watts of power (45.8 amps x 120 volts) whereas 50 amp shore power is 2 legs of 50 amp power each and can deliver around 12000 watts of power.
On this generator, you will be able to run one Air Conditioner from each leg of generator power - so 2 in total.
To truly match 50 amp shore power in a generator, you'd need something like the RV QD 12500. It runs on diesel and is in the $10,000 range (uninstalled).