Welcome to the forum.
How many will be living in the RV for 13 weeks and how much will you use it when not working?
If it's just for work, maybe you should consider a 5th wheel or large TT.
I know you like the Class A but it doesn't make sense to buy a diesel (Prevost) or a gasser just to have it sit most of the time.
Go look at everything before you buy. Visit dealer lots and RV shows. Even when buying used you can get a good idea of what interests you by looking at New units.
And, don't hesitate to ask questions on the forum. There is a lot of experience and information available here.
Enjoy your search.