I think the tow vehicle needs and prices are what moves people to a pup, but with the lighter weight TT's it is less of a concern. The beauty of a pup is you can pull it easily.
I sold our 2003 Flaggstaff 228D last week. I paid $6k for it in 2007, and sold it for $5k in 24hrs. Best money we ever spent. We loved that camper, but with extended family and friends going with us we needed bigger. After a week in the Pup in 95+ temps we decided to upgrade.
Luckily I have a 3/4ton truck I didn't have to upgrade. Really was sad unhooking from Poppy for the last time.