Originally Posted by Gary RVRoamer
...You don't really get to choose, though...
True. The manufacturer decides the axle combination for each coach. You can't order a specific coach with a specific axle set up. It is what it is. As a general rule, for DPs, 40' and under are non tag, 41' and over are tags. My last coach was 40' 11"...thus, since it was "40" it was not a tag.
The things I notice as being the biggest difference between the two is that the tag is less affected by wind and passing vehicles.