You'll needed to change the Dish to a Slimline to get the HD Sats, 99 and 103, also replace the recvr with a HD version.
Did you run the 2 lines into the RV, or are you using the ones already ran in the RV, reason I'm asking is, are you sure the lines both are accessible to the Dish and recvr with No splitters in place ... can't use a splitter in a D* line from Dish to recvr.
Anything you find , but call D* with the recvr number and Access Card (you'll need a new A/C more than likely.) make sure the person is allowed to sell it, the MAJORITY of the recvrs this day and age are LEASED, so keep that in mind.
I will is there any other hardware we need is wire outside to rv the same Do you know how I would go about finding someone to install it for us direct said we would have to pull rv to home for them to install not possible