Why have the empty and GVWR numbers on Jay Feathers gone up? From what I can find, starting in 2018 they got heavier. As an example, the 2015 X23B I own is approximately 4000 / 5000. The 2021 version is 4500 / 5500. The 25BH which was made until 2018 was 5300 / 6750. The closest model now is the 24BH which is 6300 / 7600