We have a pair of 3 speeds in the hub, 20" Dahon bikes with bags. They fold up real small and have more adjustment than the Camping World bikes. Good old bikes but I might sell them.
We also have a pair of 6 speed 20" Camping World bikes with bags that are way too large. They work OK and with the additional gears are used more than the Dahons.
We also use hybrid full size bikes for longer runs.
The 12 speed Camping World bikes have 22" tires, just try to find a replacement tire, or better yet have Camping World try to find a tire. What I found was that if a tire fails you need to scrap the bike.