I will add to my early comments and to what RVcrazy said above about 10 years from now. Our earlier trailer was a 29' (30.5' overall) and it served us well for 11 years. We really like the computer desk, king bed, large shower and two recliners that look directly at the TV.
Our new trailer/home is 39'4" OAL, and is like a little apartment, with theater seating across for a 48" TV, island kitchen with butler's pantry with counter ahead of kitchen, again a king bed and large shower. giant basement and high roof line all the way to the back which makes it feel very open. And we love it.
That said you my want to buy a slightly used trailer for a few years or up to chooser to when you are ready to snowbird. Then you will have wants nailed down better. Chris