Welcome to the forum Fred.
We do not have to much on radio change outs maybe you will be the first of a few.
In
QT's # 3 there is some discussion at bottom of thread about radio's for starters.
You have not said
what model it is but the existing radio when removed is the cut out large enough for your new radio.
If the opening needs to be enlarged the plastic dash panel can come out to enlarge the opening.
Looking
at dash board its similar to mine and you can remove the screws holding the panel to dash and drop the panel down.
You need to see how much room is at top of dash for clearance for new Kenwood.
Some of their radio's are quite large so you may have to move heat control under dash or the surface below the main dash for extra large radio..
I had a pretty good radio system in my coach and did a few Mods for it and installed a 5.1 surround system you can see in
QT's 1 & 2.
Here is a
Owners Guide for coach.