I have exploded views but scanner is down the basement in a box cuz it never gets used. I have no plans of putting back into service anytime soon. Not to mention I would be scanning copywrited material and I'm not so sure if they would like that.
But anyway....
Vw input shaft goes from clutch all the way to the back of the case and is suported by a bearing at the back and the front.
RX7 trans (which is a common design, in mazda trucks and some rangers also, of which I've rebuilt plenty) has a input shaft that is supported by a pilot bearing and then the input bearing at the front of the trans case. It (input shaft) then juts backwards torward the rear of the case, and meshes with the output shaft. The output shaft is in a straight line with the input shaft and proceeds all the way to the driveshaft. There is a little miniscule bearing that is between the input shaft and the output shaft, that is only designed to take the difference in speed that is in 1st, 2nd 3rd and 5th (4th input shaft and output shaft are 1 to 1. Most hiway driving would be in 5th which has approximatly .86 to 1 ratio. Meaning the differnece in speed of the input shaft compared to the output shaft is not very much.
With RX7 towing, the difference in speed between the input shaft and output shaft is alot, since input shaft speed is zero. This little bearing isn't meant for that.
On the Vw and alot of front wheel drive transmissions, there is no input and output shaft on the same line, so the little miniscule bearing is non existant. Now there are still bearings and gears that spin with "difference" in speed but they are full sized stuff more designed for use this way.
Once again though, if I rebuilt it I wouldn't want it towed. Get a dolly to be on the safe side. Too expensive!
Hey on a side note a customer dollied her Rear Drive 2000 (???) Mercedes SLK320 behind her motor home, with rear wheels on the ground, into kansas city yesterday. She melted down that unit good. She's calling my shop seeing if we can beat the dealers price. Very expensive mistake.