From one aluminitus infected mom to another, welcome back to the club! We also have two kids, jobs, and lots of other irons in the fire, but when we step foot into our Airstream, it transports us to another world - away from the responsibilities and routines of home. The very best part is being "unplugged" and watching our kids delight in the campground bugs, wildlife, and the simplicy trailer life. And, of course, we always get a lot of attention from our fellow campers, which is a great way for our kids to make new friends when we go camping
If you're looking at vintage, be prepared to spend some bucks to get your trailer road worthy and safe. We purchased ours for a song, but have easily tripled the amount we spent on it revamping and repairing. And, there is certainly more repairs on the way....
Our trailer is 22ft and we think it's perfect for our family of four - tows easily with our Ford Explorer V8 (which, IMHO, is also a great family car....) and has plenty of room for everyone to stretch out, sleep, and shower/bathe.
Good luck in your search, and keep us posted!