This is just my personal opinion and it's based on 40 years working and teaching mechanics, owning 2 MH's and 3 TT's and reading many, many, many posts concerning poor quality workmanship, and under building units. It's all about the bottom line. If they sell 1000 units and only 5 get more than 500-2,000 miles of use every year they can afford to go cheap. The number of complaints will be small and if they deflect and stall regarding their responsibility like they've done here they are $$$$$ ahead.
We have a FR 26 FKWS. It is supported by 4 stabs, 1 on each corner, 2-scissors jack on the frame in front of the front axle and supports under the long slide support rails. My computer screen up front vibrates when the 7-LB cat jumps off the bed in back.
Our camper has a dry weight of 6,000# and a max weight of 7,000#. It came with 2-3,000# axles. They are relying on a certain amount of tongue weight being carried by the truck and the fact that we won't put more than 400-to 500 # of cargo. It's obvious that we couldn't carry much water in the tanks either.
Lets also mention that most TT's do not come with shocks either. Shocks would lessen the stress and strain placed on the suspension and also reduce the torsional twisting placed on the frames.
That is deliberate engineering planning by FR to build on the cheap and just hope nothing happens or if it does that we eventually give up. And it's not just FR but others that are also guilty.