My '07 HR Endeavor, purchased in August of '07 equipped with an R4, was a pain in the butt from the get go. Previous owner had Direct. My dealer had a tech do the setup for my Dish receiver. Worked most of the time for a couple of years. It would occasionally loose its mind and refuse to operate. Went through a couple of expensive software upgrades.
The biggest issues I had with the R4 was rain or even heavy dew would interfere with reception. One time I had big bird take a dump on the dome and hit the exact spot to receive one of the satellites. Also since it had a single LNB, it had to move to switch between birds. It would only find all three birds about 75% of the time. We could tolerate it when only using the MH for 3-4 weeks a year. After retiring, we couldn't deal with the R4 for 3-4 months a year.
In January of '10 had Camping World in Colorado Springs install the Winegard Travler. Couldn't be happier. One button setup and you have HD before you can finish setting up your campsite.
Travler is a bit pricey, but you will save money in the long run by not throwing money at the R4. It is outdated technology.
If you camp in wooded areas I would suggest a Tailgator. We have one for our little travel trailer that we boondock in. I carry 150' of cable and can usually find a "window" to hit the birds. It has a single HD LNB, but switches between Dish's three birds almost instantly.