He'* in Colorado. Don't ask how I know that.
Bjorn, be careful how much you tow, especially if that'* the original trans. You're right at the typical limit for mileage on an L27/4T60. Most fail between 150k and 180k the first time.
I tow (click on my sig pic to see some pics of my hitch), but I have 2 transmission coolers (one came on the car, I added the other), and a trans temp gauge. It'* scary how the trans temps can spike when towing, especially in the summer. I pull a light utility trailer (well, lightly LOADED) only.
I built Matilda for heavy capacity, but light weight. All tubular steel. 5'2" x 8'4" inside dimensions. Sorry, in these pics I didn't have the side rails on yet, but imagine three 2x6'* running around the inside horizontally.
I'm posting the pics to give you an idea of what I'm talking about. This trailer EMPTY at 55mph for 15 minutes will raise my trans temps 30-50 degrees depending on summer temps.