

Now looking at it I don't see too much difference
in it either, but their site said:
The Super Swamper LTBs are in the same basic 
Three Stage Lug design as the famous Super 
Swamper TSL’s but a little more aggressive.  The 
large lug is offset more to the outside which gives 
the tire superb traction.  It is in bias ply construction 
which allows for the more aggressive lugs and very 
strong sidewalls to better resist the rigors of hard off-roading.
The bias construction reduces the chances 
of sidewall splitting when run off road at low air 
pressure.  There are seven sizes available….sizes 
which are not available in the regular TSL line.
 :-/
Wild