I have never heard of an RV manufacturer supplying anything other than the basic AC unit. You can add a hard start capacitor or a soft start kit if you need to run on a marginal generator. Personally, I would get a generator large enough to do the job so that other loads could be powered as well.
I’ve got a Honda 3000 inverter generator it will run 1 ac no problem. I made a heavy duty cord to plug it to the camper with a 50 amp end and a generator 30 amp on the other. But I have used 2 adapters and plugged it it to the 20 amp plug with no problem for a short period of time but I fell better with the cord I made .
I have an 8000 BTU window type a/c that came with our camper. Rated running watts (not start up watts) is 816 Watts or roughly 7.4 Amps. I wanted the generator to run the A/C in eco mode for the noise and fuel use benefit.
After reading reviews from people that have successfully tried it, I bought a Supco Super Boost Relay and Hard Start Capacitor, model SPP6. This cost around $15 on Amazon.
With my Wen 56200i inverter generator, which is rated at 2000W peak and 1600W running I was able to run my A/C with eco mode off. The only caveat would be that the occasional sound of the generator changing pitch and noise level (which was measured at about 2 dB change) may be more annoying than just running with eco mode off.
NOTE: I did not have any other high current devices (refrigerator, water heater, etc.) running on generator power.
The SPP6 may also help in cases where your generator may have some difficulty getting the A/C to start with eco mode off (if using an inverter generator). There are plenty of videos that show you how this is done.