We also have a 3124KS and tow it with a Chevy Duramax Diesel. I know too much vehicle for what we tow. We get great mpg and it tows like a dream.
Mustang I bet you are looking a a 3326 King though. The 3326 King is two feet longer then ours and also a side dinette......making it heavier then our camper.
For your info there is also a 3124 KB. The year the camper was built could effect the weight. The wood frame ones...the older models are heavier then the ones since about 2001/2002 (I think ...but could be wrong on the exact year.)
You can go to
www.trailmanors.com and look at the various current floor plans.