I'm gonna guess the safety factor goes away when you bolt seats to the floor. At the very least I'd contact a conversion company and see if they can give you any insight as to what's a legal and safe way to secure seats in the back properly. On the otherhand, look at a motorhome, I don't imagine they have any real rollover protection and having seatbelts in the cheapo wood dinette doesn't seem like the safest thing in the world. Probably better than driving a motorcycle I guess lol.