We have a 2009 Jayco Greyhawk 31FS. The motorhome is completely usable with both slides in. However, with the bedroom slide in, the wardrobe is snug against the bed, so if you are tall, that could be a problem. I'm 5'11" and my feet just barely touch the wardrobe. The bathroom door also does not fully open, but I'm a big guy and can just squeeze into the bathroom with the slide in.
When we first bought our Greyhawk in 2009 our kids were 8 and 6 and they loved the idea of the bunk beds. They used the bunks for about 3 years. Now they both complain they are too small. Actually they are too narrow. Our bunks are 29" wide, so an inch narrower than the Winnebago and 3" narrower than your FVer. I think a standard twin is 38" wide.
They do not use the bunks anymore. They are used as storage and/or for guests. However, we are thinking of having a custom made twin size mattress that is as wide as a normal twin but short enough to fit in the motorhome's lower bunk four our daughter. We'll just use plywood to support the extra 9" width. The mattress should not impede the bathroom door because there is about 6" or so of empty space between the edge of the bed and the end of the slide and there is plenty of room between the door and the slide when it is open.
Our Greyhawk is 32' 2" long. It has a single ducted 13.5k A/C unit. I have always wished it had a second one in place of the thermostatically controlled ceiling fan in the bedroom. Just a small one, like 5k-8k so that we could close off the ducts in the bedroom. I think that would help the main unit cool the rest of the motorhome. As for heat, our Greyhawk only has 1 heating duct in the main living area and it is below the sink. When we winter camp our son uses a heated blanket on the cab over bed because the heat doesn't fully warm that area. I've talked about getting a small space heater, but my wife doesn't like that idea.
I have been in the Aspect and the Sunseeker, but I did not drive them. Our Greyhawk handles great right off the showroom floor. I normally drive around 70 mph and have no problem with trucks passing. I drive with 1 hand, actually usually just a few fingers, on the steering wheel. Although now that we have a toad, we aren't suppose to exceed 65 mph (limited by the toad) which stinks because most of where we drive has 70 mph speed limit.
-Michael
