Your friends will be fine. We biked through all the partial loops and they all look like the full hookup sites in terms of size and maneuverability. I bet we could fit our 43ft Class A in all the sites if we had to. I guess we have a lot of practice squeezing into Maryland State Park sites.
Actually, the Tent loop sites are NOT the same size as the Full. Many of them, particularly, in 1500, are much shorter (2000 are bigger but a guest has no control). There are apps and site info with measurements out on the Interwebz that back this up. There's even threads on the DIS Camping Board that back this up.
I get it if some folks wait too long to book an appropriate site for their rig and are still looking. And keep in mind that many folks have a travel trailer AND a tow vehicle to put on a site (technically one can put the vehicle in the parking lot but that is an inconvenience). While a 43' Class A may fit, if somebody has a toad, it may not. So sweeping statements such as "they all look like the full" are misleading. Get there on a busy checkin day late in the evening and there may not be a spot that fits you (the earlier arriving guests will have moved around before you got there).
As stated above, it's possible to initially get a Partial but then they'll get moved and upcharged if there is space available.
Not trying to beat a dead horse here, but just got back yesterday from a 2 night off site followed by 5 nights at the fort in a partial site, they had the 2000 loop closed for refurb, so we were all in 1500. Left Friday morning and 2 trailers had checked in Thursday that had to be close to 28 feet.
2000 closed. The weekends tend to be filled so these folks could have been moved if they were still there on Sunday afternoon. They could have been a temporary exception rather than the rule.
Not trying to beat a dead horse here

Plenty of past threads on this topic. Disney doesn't like to talk about those moves. No worries, Marshel.
Bama Ed
PS - some folks have gone out and gathered data to make fact-driven decisions and generously made that data available to the public in various forms. One of them is handsome, charming, debonair, young-at-heart, and posts from time to time on this forum.
