Are you now or have you been RVers? If not, then it will be a hard sell unless he tries it first. On the other hand, if you already own an RV why not go on longer and longer trips? You don't have to be full-timers which definitely is not for everyone. We go on long trips of anywhere from two to four to six months and it's always good to get back to our stick 'n brick house. There are a lot of fulltimers here on the RV Forum and they love their lifestyle and wouldn't be happy doing it our way.
I can tell you that BOTH people really have to want to do it to be successful at fulltiming. I've known couples where one "gave in" to the other's dream and it just didn't work. In fact, one couple divorced within six months which was a shame because they had sold or given everything away and she had to start all over again after having retired (he kept the RV). There also are couples who decide to do it and both have had enough after a year or two. Others go on for six, ten, or more years and are perfectly happy. Sometimes one or the other finally says enough is enough and they settle down but still take occasional trips. For those who make it longer, they know they'll eventually have to hang up the keys and that's something you also have to take into account.
Whatever you and hubby decide, I hope you're both happy and enjoy the RV lifestyle, whether it's as short-timers, long-timers, or full-timers.
ArdraF