Dont know how you keep up with such a small batt pack, but good luck with whatever you go with.
Generally April to mid September its fine. Battery is generally charged by mid to late morning. Its not like we are light users either with all the toys but the van itself uses very little power otherwise. If we are away outside those months I generally want to be hooked up anyway. Batteries and more solar is more weight of course and we are generally maxed out with the bike on the rack.