Not sure what you are asking. The Dolphins used the Workhorse W22 & W24 chassis in a couple different wheelbase lengths. Most models were the W22, but the Dolphin LX 6355/6375/6376 models used the heavier duty W24.
Here is the 2005 Dolphin brochure
https://www.rvroundtable.com/wp-content/uploads/National/2005.NationalRVDolphin.pdf