CyberTruck Powering an RV for the weekend

[Bipster]

OK, renting an RV trailer for the weekend. Instead of using a Generator, thinking of using CT to power it for the weekend. Big draw is going to be AC and plan to run 24hrs/day. In Texas, and this will be in October, so could be cool or could be cook’in. Looks like AC units run from 500W to 2700W, with most falling in the range of 750 to 1500W. So, with a 123 KWH battery in the CyberTruck, I’m thinking I should be golden, but here are a couple of questions:
1) To hook up to RV, do I have to use the Bed 220 outlet or can I use the mobile charging cable with the right adapter? I’m assuming I can use the charging cable as the charge port for the truck seems to be bi-directional.
2) At 1500W, seems to me that I would have ~80hrs, assuming no other load
3) I’m assuming Tesla’s rating of 123 KWH is at 100% charge, so at 80% it would be proportionately less
Thanks in advance for your feedback

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[countryboy]

1) Use 240v in bed
2) at 1500w, about ~50 hours from 80% starting charge to 20% remaining
3) Exactly, and how much charge needs to be reserved to get home or nearest charger?

If larger AC unit, I'd estimate 2000W running, so ~39 hours from 80 to 20%. I'd plan to run AC as needed but open the windows at night if possible. Also, if trailer has batteries make sure they are well charged before you head out so you're not draining your CT with that.