The largest rear compartments I've seen from Thor are when the rear walk-around queen bed is stationary with headboard at back wall of motorhome. I happen to like this layout a lot.
Thor does an OK job with these designs for those who want permanent walk-around bed and don't necessarily want or need an expandable bedroom. The design should also work very well with Twin/King beds like on Axis 24.1.
The main issue for us (and a few others I'm sure) is that these layouts (or similar) aren't offered in smaller motorhomes. At present I can find the Class C Chateau 28Z and Class A 31Z that start at close to 30 feet in length, and go larger from there.
The other difference compared to Euro-style "garages" is that they are not as tall nor have a flat load floor. That makes loading bikes, scooters, or motorcycles less practical. Thor has manufactured a few motorhomes with large and tall garages in rear, but they were fairly large front-engine diesels. We looked at a couple of these but they were so large and so noisy.
I suppose they could be reading the market, but as far as I know they haven't tried a large and tall Euro-style garage in a smaller motorhome. Given that most European motorhomes have one, why not give it a try? Even if offered as a cost-added option.
This is picture of bike garage from larger 31Z. Not ideal in my opinion.
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