You can get Victron inverters and chain four of them together to get 12,000 watts if you wanted (50A equivalent) but two would match your genset more closely. The issue is batteries. If your truck has dual alternators and you invest in a good high-current DC to DC converter for charging you may pull it off. But Jayco doesn’t make a trailer that even comes close to cargo carrying capacity of some of the higher end class a motorhomes. There isn’t enough roof space to get 6,000 watts (or more) of solar to keep up with the loads. Even with the lightest lithium batteries I’ve seen at around 30lbs for 100Ah, you’d need 100 batteries at 100Ah to run even 6,000 watts for 20 hours. That’s 3,000lbs of batteries. If you want to step up to full 50A service on inverters for 20 hours, you’re up to 6,000lbs.
Reality is almost nobody would use 50A at 100% for 20 hours. So try to use a calculator for power use (popular for solar sites) and work from there. If you want to use inverters and batteries, start with reducing your needs as low as possible first, rather than building up to the same as plugging into 50A service.
With two 3000 watt inverters I can run both ACs while I drive, but I’m pulling almost 4,000 watts from the dual high-output alternators on the truck while I drive. Using solar I get less than half that in full sun in ideal conditions. And solar isn’t all day long. Without using anything else, I could get maybe a few hours AC from solar, assuming a single AC in use only, and four 100Ah batteries.
My reason mostly for the inverters and batteries are because I’m in a seasonal park with 30A rather than 50A. It’s great to supplement and it lets me stay in an older park with so many trees I can’t see a neighbor in any direction. It lets me run the second AC, washer/dryer, etc. without worrying. It’s not a setup to run AC in place of a generator.