Why not use an inverter to charge your bike battery while you drive? My truck has a built in 450W inverter that I use with my ebike charger. I usually carry several batteries, and charge them while driving between riding destinations.
Inverters that plug into a cigarette lighter socket, like this one, are considerably cheaper than a solar generator:
View attachment 187696
If you want to charge while the vehicle is parked, then the solar generator would be an option.
Welcome to the forum and by all means, post pics of your rides!
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