Under Bed Base Size
I am making an assumption here, but was curious if anyone knew for sure about this.
I have looked at a lot of different models, both with king and queen beds as an option but it is hard to tell from eyeballing it whether the base of the bed itself is the same size for both queen and king, and depending on the bed size ordered, Jayco just uses different size plywood on top of a standard base.
My "assumption" is that in the base and slide itself are the same size and Jayco just installs wider/larger plywood sheeting on top of a standard size base to accommodate the larger mattress. They may also change the side table as well, but that is not so much of a problem in my opinion if one wanted to change out a queen for a king later on by simply changing out the plywood sheeting as well.