The 'A's seem to have more room to mount things while the 'C's have less room. Find out how easy it is to access the water pump, sometimes they bury them.
Three slides ? Make sure that floorplan can be used with the slides 'IN'. I'm not sure how that QB is configured. If its a folding mattress or not. You will be lacking a cabover bed as an alternate.
Those slides might not be the same quality as your 'A' had. I would research what type of slide and who makes it, then check that brands repair history. Find out how easy or difficult it is to access the motors in each of those slides. Some are difficult in some 'C's.
Then I would check to see how to repair it just in case you have to make a repair yourself. RV appointments can be few and far between these days and as you know, you can't drive with a slide deployed.
How is that 5 speed trans. in the 2011 Ford ? Good/bad ?