I saw a pic yesterday of a car in Russia which was host to a big bear who had his/ her head out the window (of the back seat I should add).
Because it was wearing a seatbelt and not breaking any rules the police allowed it to continue.
Out here in Australia I used to hear accounts of cockies (farmers) carrying sheep around in Rolls Royces.
We personally had a visit from friends on their way home who had a small horse in the back seat of their Ford Falcon car.
So we have heard all about your dogs, your mattresses, your lumber, plywood et al.
What are you going to carry in there that will make everyone cringe?
A guy I knew, Bob Jane, was a racing driver and towed his race car trailer with a Mercedes 600 Grosser, much to the mixed awe and disgust of other Benz owners.Even a tow bar alone was considered sacrilege to the pure and just. That was , like, the biggest Benz on the road, effectively a factory stretch limo.
(He also had it fitted with musical horns...) Now he owns the race track too. And 100s of tire shops.