5 x 11' idea with kitchenette inside

**I apologize for the sketch being VERY rough. I'll eventually convert my sketch to a CAD program once the hairy details are finalized.
Ideas of mine (keep in mind that I don't have any building experience):
1. I want the door to open to a floor, not a bed.
2. I want the kitchenette to be inside the main cabin.
3. I want to fit a queen size bed in it.
4. Having the bed raised about 5", so the end can be used as seating, with a swing-out tray attached to the wall to be used as a makeshift table. (There'd be storage underneath the bed, when lifted.)
5. Instead of a traditional 4' ceiling, I'd make it 5.5'. (I'm tall, and don't want to feel like I'm slumping over the whole time!)
6. I'd put a skylight over the head of the bed to see the stars at night.
Problems I'm having:
1. Finding a flatbed trailer to meet my 5 x 11 specifications.
2. Making it light enough for my Rav4 to tow.
3. Having the mattress not fit too snuggly, to where putting new sheets on it is a pain.
Ideas of mine (keep in mind that I don't have any building experience):
1. I want the door to open to a floor, not a bed.
2. I want the kitchenette to be inside the main cabin.
3. I want to fit a queen size bed in it.
4. Having the bed raised about 5", so the end can be used as seating, with a swing-out tray attached to the wall to be used as a makeshift table. (There'd be storage underneath the bed, when lifted.)
5. Instead of a traditional 4' ceiling, I'd make it 5.5'. (I'm tall, and don't want to feel like I'm slumping over the whole time!)
6. I'd put a skylight over the head of the bed to see the stars at night.
Problems I'm having:
1. Finding a flatbed trailer to meet my 5 x 11 specifications.
2. Making it light enough for my Rav4 to tow.
3. Having the mattress not fit too snuggly, to where putting new sheets on it is a pain.