The problem will be figuring out what a replacement unit is - there is not a tremendous number of Via owners that have completed this replacement and documented it.
Never say never, someone could show up here with direct knowledge about what you need.
For the rest of us, we'd need to know exactly what model Xite system you have to know about what fits in that space. And, then the camera connections are another thing to figure out as well.
I always recommend people take their RV, if possible, to an auto sound system installer. Those folks can look it it, remove it, figure what's needed and install it.
Another choice is to call Crutchfield. They specialize in this kind of thing over the phone, but I tend to think when it comes to RVs and Xite they might not be fully up to speed.
RV dealerships are probably the worst place to get this kind of work done. So, I'd never suggest going that route and Winnebago will be of no help either. It's not their kind of service.
Best of luck - oh, and do some checking on
www.irv2.com as well. There are vastly more folks there with all kinds of RVs and those Xite systems were sold to many different manufacturers.