Trying to understand AH

[sloppydogdrool]

I have a question about the C rating. I understand it but need some advice. I am buying a Star Sirius and getting a lithium battery. They offer 80, 110, 210 AH. I carry 4 people and go up long steep hills. I'm assuming that's where the total amps and AMP Hours comes into play. So how much do I need? Do I need the 210 or could I get away with a 110 or 80? Star ships the lifted cart with 110. I'm thinking even they know it takes more amps for the bigger tires. It's a big investment so I don't want to chose something I'll be unhappy with or won't meet my needs.