DOES THE HDK SUSPENSION K-MEMBER HANDLE BETTER THAN A T-BAR SUSPENSION?

I can see that. For that, it seems right.
Again, I may be expecting too much after dealing with the strength and durability of the stock stuff.
I'm a retired Carpenter that worked most of my life building houses and schools up to Bay Area earthquake standards. What I was trained to build would be grossly OVERbuilt for Colorado, Texas or Michigan. I'm talking thicker lumber, more reinforcements, blocking, metal straps, everything possible. THEN I retired and helped a few times on remodel work for friends and was shocked at how poorly built some 50-100 year old houses are...yet they are still standing today despite lacking the very reinforcements I thought were necessary.
This has led to some "questioning" of methods and procedures I've followed with other things.
Don't use drugs, you'll get hooked.
Don't have unprotected sex, you'll get her pregnant the first time.

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My point?
Maybe I've been led to believe that we needed all that extra mass just to hold it all together but maybe it could have been revised to cut weight without being detrimental to durability.
Intended use. To haul a big trailer, you could use a small block built to big block power, but it will not last as long. There is a good reason that large industrial engines have cylinder block castings 1" or more thick. It is to withstand vibrations and flex that is imposed while running at 100% power for 24/7 for months at a time.
Clownyfornicatia has a tendency to go overboard when a disaster occurs, such as earth quakes. Now the old homes may not have been subjected to the extreme ground displacements for one reason or another. Codes were changed so that during new construction and remodels, homes would be strengthened to prevent total collapse.
In a race car where weight is generally a penalty, they are built light. Colin Chapman, founder of Lotus Cars removed weight wherever he could until a failure occured wherein he added a bit of strengthening. The original Lotus Seven was only 950 pounds. These early chassis had a propensity to crack just behind the seats. Later cars added about 75 pounds. Chaterham worked for Lotus Cars and bought the rights when Chapman ceased production of the Seven. He beefed up the chassis more and installed larger and torquier engines under Chaterham Cars. These generally are between 1150# and 1250# and have had up to 310HP 2.0l Duratec engines installed.