Lithium vs 6v reviews?

Hey all, been camping in a truck cap for a few years and finally bought a slide in camper, an 08 eagle cap 850.

Any way need a new set of batteries for my new to me camper. Looking for some real world reviews on lithium batteries vs 6v golf cart batteries.

Background: I live up in Canada so conditions could range from -15c to +30c. I have a solar panel and charge controller that came with the unit. I like to camp off grid mostly with out power hook ups (5-7 days).