IIRC, Matt posted something about adding extra rope to the trax so that they can be tied to the front and rear crossbars and so positioned at a good balance point for pulling. If you balance the trax so that the boat's weight is even fore and aft and won't shift, the stability lightens the load... somewhat. That's an inexpensive help. You would have to do a search to find the post.
A boat on trax with the cradles and T handle on the trax is essentially a boat on a trailer made for sand! You could winch it to a nearby trailer, pull it with an ATV, use the righting line to pull and harness up a team of horses... or the rest of the family.
This is always a matter of how far you have to pull and where you are going... To a trailer? To a house? To a trailer in a parking lot three football field lengths or more away? To a parking lot just on the other side of high dune?
Interesting post here
on backs and boats.
Always has bugged me that boats of all other types are set up with hard-surface ramps and docks to encourage boating, but there are few setups for beachcats. Many beaches around here even have kayak access now.