Interestingly enough that is not a Jayco thing. These crappy legs were introduced by the industry early in the last decade. Jayco started using them in the 2013 model year. I absolutely hate them. As you said they are heavy and difficult to use. They are also a pinch hazard. The old style legs were simple and easy.
We take our table outside, which was really hard with the original legs because they were so bulky. More floor space inside and if we have to eat inside we sit on the couch anyway.
I replaced those crappy legs with the old style folding legs. Shortly after that the table top was ruined in a rainstorm. I had a friend make a replacement table top from cedar. Much lighter and stronger than the original press wood table. And it's pretty much water proof now.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)