Nope, no "snow tow" out in the boondocks!
There are several methods to tow. The best way is to remove the drive belt from the disabled sled and then use what is known as a three point tow rope. These are available on-line or at any parts or dealer store for usually ten bucks on up. When travelling flat terrain or going up hills, it is pretty straightforward. The problem comes getting a disabled sled down a steep hill. What you do then is simply hook the disabled sled up in front of the tow sled and let the tow sled brake the disabled sled downhill.
Towing can put a strain on the sled donig the towing, but sometimes you have to make do.
In an emergency, a spare drive belt or the drive belt from the disabled sled can be used as a temporary tow strap. I actually saw two Fish & Game officers using this method to tow one of their disabled State sleds this past weekend up in North Conway.
You can read some important
SAFETY TIPS here, it is from a course that I teach in refeence to snowmobile safety.