Cliff,
The tow dolly from U-haul works very well with the 914. I used it to tow my new purchase from Oxnard, CA to Phoenix, AZ. - no problems. The only precaution is to make sure the rear shocks are in decent shape so that the tail end won't scrape if you hit a bump. The dolly elivates the front, causing the tail to be lower than normal. Mine had firm shocks and at least 100# springs.
Also you may be tempted to tie off the shift level to try and keep the tranny in neutral - don't do it! Just put it in neutral and it will stay there.
Good luck,
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Gerard
74-914 2.0L
3D914
rodrigos6@juno.com