I just ran across a comparison article about the Maxtrax and TRED. One comment was that the TRED becomes incredibly heavy when packed with clay. The Max was much better in this respect.
I don't have to deal with clay, so it isn't a big issue with me.
"Paul:
I have maxtrax, my mate has treds, we used them all in a really muddy bog extracting 4 cars. All were good and did the job, but The maxtrax held much less mud after the work and were by far easier to retrieve. The treds ended up almost too heavy to carry with clogged clay and when cleaning them, we stood in a river for 2 hrs to dig the clay off them.
Get the maxtrax as life is too short to spend hours cleaning them or carrying half the country around with you.
A real side by side test in real world conditions without the manufacturers hype"
http://blog.mud-maps.com/blog/2013/category/max-trax-vs-tred
John Davies
Spokane WA USA