Ours is what you'd call a 'Lite' 5th wheel. 7315 lbs dry, 1385 lbs for dry pin.
All loaded we're at 9000 lbs and 1800 lbs on the pin. Could you tow it with a 1/2 ton? Yes I've seen several doing it. On a recent trip we returned home with a full grey, almost full black and mostly full fresh tanks. Oregon has truck scales open 24/7 so we saw one not being uses and dropped in for a quick weigh. My pin was 2200 lbs. Not in the 'Lite' category anymore.
I've also got 4315 lbs for CCC. Doubt you'll find that in any other 28' 5th wheel.
Most 1/2 ton 'Lites' that I look at have something that makes them lite. Most don't have much CCC.
After reading all the 'Lite' threads it seems as though many that own 'Lites' are not having issues because of the lighter weight. Apples to apples they should do just fine being towed all over.
Whats the difference between having a heavy 5er and stiffer suspension than a light 5er having softer suspension? Nothing really.
There's a thread on here right now about a new Montana having frame issues. Montana would be considered a semi to full time 5th wheel by many. Drive thru any RV park and you can a Montana or two where someones on the road for extended periods.
There's also a guy on here that owns a 'Lite Flagstaff or Rockwood (can't remember which) and has had zero issues towing all over the country.
Go figure.