In answer to the original question, the product you are looking for is available here. I have used one of the trailers for many years without problems. The dogs travel well, have circulated temperature contolled air, and have always arrived fit and well after journeys of several hundred miles. If you go to any of the major European dog shows or trials you will see hundreds of trailers there. As to mounting a box on the towbar, I have never used one, but cannot see any logical reason why the ride will be any different than when a dog is sitting in a cage in the rear of a vehicle. It's still at the back, and the same vehicle.

On a similar point, I saw a picture at the weekend, where someone had converted his rear garage locker into dog cages. The conversion looked quite neat.

Here are Rosie and Jack in their crate in the garage of our van. The crate has a removable divider and each side has a door out the rear of the van. On the forward side of the crate there's a door into the interior of the van and they can easily fit either side of the divider to go in and out. The space above the crate usually holds a folded metal puppy pen, grooming trolley and two folding loungers, plus our 'show' bag etc.
The centre of the worktop is removable for tall, thin loads and there's a half height wardrobe above the nearside and a hot and cold extending shower head in the white box on the offside van wall.
I still can't figure out why manufacturers insist on fitting a fixed bulkhead between garage and van interior. It gives much more flexibility to the customer if they can get into the garage from inside, including the ability to have a dog crate. As usual you have to watch out for ventlation and heat, but in our case, when parked, as you can see, we can open the whole liftback door for air.

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Maybe let the dog drive and you sit in the box.

The spam I reported has been deleted!