WRT a slide, there are three things I must be able to do with the slide in, or that floor plan is a no go.
1) I must be able to get to the bed with the slide in. If I stop and need to take a 30 minute to 1 hour nap, I must be able to use the bed without putting the slide out.
2) If I stop somewhere that a rest room isn't available, I must be able to get to the TT's bathroom with the slide in.
3) I must be able to get to the refrigerator with the slide in.
I a floor plan fails any of these, I move to the next floor plan.