Personally I always found NADA pretty useless for Class B prices. Especially right now when there is an unusually high demand. People are getting top dollar.
I would recommend going to look at it, just for the experience. BUT...I think I would get that A sold, and window shop for a bit. See what is really out there in the market now and find the one that works best for how you want to use it. You don't want to spend $100K for a 4 year old rig when there are new ones out there for that price.
(Sorry for the loss of your husband... can you drive the Class A since you are full time)