Speaking from pure, unadulterated ignorance; I think the towing 4 down problem is associated with lack of lubrication.

"there is one or more bearings in the transmission that need to be lubed and some require a lube pump to be turning."

I do know that when I towed my Suzuki Samurai 4 down with the tranny and TX in neutral, the odo and speedo both registered. That indicates to me that there is much more moving than you would ever expect whilst in neutral.

Eric,

Since you have the vehicle running and in neutral, you should be fine. You're supposed to check fluid level on an automatic tranny only after idling in neutral for 10 min to ensure proper reading. That implies to me that the pump is running and therefore keeping everything lubed.

Tom