That is an issue, that your journey will be generally into the wind. But come summer, the wind will get more variable, and you might have tail wind as much as headwind. A spring trip that direction would mean riding only in the morning or at night.
I think, especially since you will haul a trailer and weigh 200 pounds more than my rig, you will want to carry at least 2000 wh. If you de rate just a tad, a 48v 15 ah battery has about 700wh. So three pings that size or whatever would be a good setup. But three 5 amps chargers could blow some breakers, depending on what you end up plugging into. A plug may not handle two coke machines, and your three chargers. Don't count on more than 10 amps ac usable from any plug. Old breakers will pop at 12 amps or less.
Two 48v 20 ah sections of battery might be a good way to go, plus you might consider an emergency pack, in a 5ah 14s RC battery. That would give you more than 2kwh, and a small OH Shit, reserve pack.
But look at weights, you might be able to carry just one 48v 20 ah battery, and the generator. That makes your range infinite, but does mean you might do lots of riding listening to the thing run. You'd get a few hours in the AM with it off, perhaps 30 miles, then have to hear it run the rest of the day, and into the night at the camp.
Even if you have just one battery, two chargers is a must. Or at least, have one packed and ready for somebody to mail it to you.
