I have seen on ebay, Phoenix Cruisers around year 2000, which are vans with extended roofs, called a class-B. All were constructed on the Dodge Ram van as shown here.
Somewhere around the same time, they offered a larger B+ configuration which is the same basic design today. The rear back then looked like this. Note how the entry door looks when open. They later came up with the pivoting hindge most of us enjoy today.
They improved again around 2004/2005 with significant improvements in construction and features, the most noticable one being the rear wall having an integrated spare tire compartment and larger outside storage as shown here.
Other extras included an improved entry door (maybe introduced a few years earlier), high intensity LED tail lights, the inverter with twin batteries and the maserator pump. I don't know when they started offering so many models, but when I bought mine in 2007 they had a bunch, adding at least 2 more floor plans and the Sprinter since. Every year they seem to get a little better.
I don't know if Kermit owned Phoenix USA all throughout it's history, or if he bought into it along the way.