Keep hunting for the right trailer. I have a buddy how flat tows behind his RV, when he gets there he usually doesn't wheel that day because of the time it takes to get all the tow bar parts off and reinstall drive shafts.
Is your buddy removing the drive shafts from a Jeep to flat tow it? If he is he's doing it wrong. All you have to do is put the tcase in neutral. I flat tow my TJ behind my rv and I'm unhooked and ready to go in less than 15 minutes and that's taking my time. I'm not saying getting a trailer isn't the right choice, I'm considering getting one for the trips when I'm going to be wheeling. But the difference in the time to unload vs. unhook is negligible.