Where do you find such a dolly? How is the car mounted on it?
Th only tow dolly I've used are the U-Haul kind with the wheels on the outside of the towed vehicle and pivoting ramps - which might be a problem with the Smart with its short wheelbase, not to mention its narrow track.
not sure I would use one from the front of a smart, Only time I used one was on a rear wheel drive with the drive shaft removed, or a front wheel drive car. I rented a trailer when I towed my smart home.
If JC Whitney doesn't have it....you probably don't need it. Years ago, when a car nerd drove through the local Dog and Suds with a lot of useless crap on it, people said it was "Race prepared by JC Whitney".
It's looking me little bit risky towing, I think the right way to tow this in a trailer. you need a small trailer cause car has a small size, i have some towing experience at https://www.ritewaytowingnyc.com/roadside-assistance"emergency roadside assistance service ny, so the trailer will the right choice according to me.
Using a tow dolly, you should tow rear wheels up. If you tow all 4 down, then be sure to do the bungie cord trick for the steering wheel so it doesn't get out of hand.
I decided to go with a motorcycle trailer, MC2F from Aluma. Got one used for less than a tow dolly. Tried loading as a tilt trailer, which is possible, but too scary for me, so I ordered a second ramp and use two jacks to support the back end fold-down portion when loading unloading. Works very smoothly and just fits my 2015 Smart ED.
I did make some additional mods to extend the aluminum channel at the rear to support the fold-down end better, since the wheels overhang on to it somewhat. I'm also now adding electric brakes to help my RV braking and safer downhill travel.
I back it on to get at least 10% tongue weight. The red mark in this picture marks the center of gravity. Couldn't find a better picture at the moment.