Can you back up with a toad 4 down

Very little. Never recommended, just too much chance of damage to your tow apparatus.I have backed up a few feet, just until I observed the toad front wheels start to go to the side.

According to the manufacturers you can never back up. Have some people done it, yes.

I tried it once with a Jeep on a towbar.
I made it back in a straight line about 5 feet when the front wheels of the Jeep SLAMMED over against the steering stops.
I never tried it again, and I never will, no matter who says they have successfully done it!

I crank my Saturn up and has wife to ster if i need to back straigh.

In a word; no. If you push the toad the wheels will crank to the stop.

However, I have rolled backward down a hill 20' before when I pulled past the propane fill to register.

Of course you can. Its no different than backing a short trailer behind a long wheelbase truck, except for the front wheels of the towed.
For them, have a spotter watch them or. even get behind the wheel to keep them in line while backing.
For the naysayers that claim hitch damage could occur, how do you justify the hitch pressure that occurs when braking the MH when the towed does not have braking power?
Go to an empty lot. Try it. You can do it, noone will get their arms torn off, wrists broken , as suggested when I opened a thread on this same subject.

Go read it.
search for ' backing' in my posts.

Max

williamp321 has it correct

Yes but there are a lot of buts. I've backed in a straight line a good 30 feet pushing a 1998 Honda Accord slower than my 102 year old Grand Father walks. I think the key is everything has to be lined up in a straight line before you even consider putting the coach in reverse. Once the hitch starts to pivot and the toad steering wheel starts moving everything can go bad very quickly.

On a side note I tie a white rag to the top on the Honda's steering wheel that I can see in the coach rear camera. If the steering starts to move I stop. Backing a four down is best avoided if possible.

Very slowly and keep your eyes on the steering wheel in the camera. If the wheel moves STOP immediately. That is how far you can back up.

I done that before and it cranked the steering wheel hard to left, more like a snapped to left. When I moved forward, it would not straighten out on its own and it was dragging the tires. So I had to get out and straighten the wheel myself.