Bill, PVR/DVR are really the same thing.. some have used PVR as a marketing ploy to make it sound really different than a DVR..... that being said most whole house DVR setups are utilizing an Ethernet signal between the devices to stream/send/broadcast recordings from your main DVR to those TVs that may only have a standard digital receiver. Thus you can watch anything recorded from 1 DVR unit on any TV in the house with similar equipment that is connected in the "network".
You don't specify which system you have, DirecTV or Dish, but DirecTV uses SWM (single wire multiplexer) more commonly now. This allows 1 wire coming from the dish to be run thru the roof and that one wire can feed an unlimited amount of receivers in the SWM network within your coach. The old way was to run a seperate wire from the dish's LNBs for each TV you were placing a receiver at. Additionally, the whole-house signal that allows you to watch recorded programs from the DVR on any other receiver in the system is broadcast right thru the very same coaxial cable - no need for more wires!
You also mention that you can watch TV from your satellite on any of the 4 TVs, but my assumption is that those TV's each are showing the same program? With the newer SWM setup on DirecTV you can place a receiver at each of the 4 TV's and watch 4 seperate programs - if one of those receivers is a DVR and you enable the "whole-home" function, you can watch programs recorded from that DVR on any of the receivers in the coach seperately, meanwhile someone else could be watching live TV on one of the others.
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified