YOu can rent a Truck from Uhaul with a towing hitch and tow your own thing...BTDT...thats how Catigale came home, and it was all above board with Uhaul
This appears to be a matter of luck more than anything else. Four years ago I couldn't get any rental company including Uhaul to rent me a vehicle of any sort to tow a trailer. Not a Mac, but still...Yes, I talked with the Uhaul rep in Houston, TX. They would let me tow the boat legally. Maybe thats the best bet.
As recently as summer '05 one of the Conch Cruisers had the same answer (no towing) from every rental company.
I think you are wise to not attempt such a tow with your Mazda MPV. Though I'm nearly certain there are some out there who have towed a Mac with an MPV (and every other indequate vehicle you can name) towing with an inadequate vehicle is little more than an accident which hasn't happened yet.
I don't know your situation otherwise, but UHaul is going to hit your $$ big time no matter how you do it. Unless you're planning on never towing again, you might consider taking that $$ and instead putting it toward an adequate tow vehicle.
I am one of those admittedly few who have gone the tandem axle route and I would recommend it to anyone who tows frequently, particularly long distances. However, it isn't the only solution to tail wagging, which is almost certainly caused by inadequate tongue weight. If you don't like shifting all the movable weight forward and leaving the fuel locker tanks empty, you can move the existing axle aft for a fraction of the cost of a second axle.
