I have a 2008 Contessa where the Direct TV box is located in the front Cap cabinetry. I decided to change the receiver from HD to HD/DVR. I had a Wineguard dish installed at purchase time rather than the dome upon the Bend Beaver shop recommendation as it presents "less" problems than the domes and can receive HD. There are two feeds coming in from the dish (factory pre-wiring) so I decided to change out to the HDDVR. PROBLEM is that despite my adding two layers of additional insulation in the cabinet, the HD/DVR gets too HOT because it has a hard drive inside and when it does so it goes "out to lunch" or locks up in a self protective mode I guess until the temperature reduces to allow it to return to "normal". Over the long run what damage this may do is not known, but I can't believe i will be good. I have (while stationary) used a fan mounted on the raised door to help keep it cool. There is an A/C vent in the cabinet, but if the A/C isn't running or needed then it doesn't help.
Space is limited in the cabinet and I have not been able to find a fan small enough to keep it cool that will fit inside the cabinet. Also most fans I have found are 12v rather than 120, so one has to extend/drape the cord up from the 12v plugs in the dash.
If it weren't for the location of cabinet/receiver etc in the front cap it might not be a problem.
Even parked at home (not using the MH) and plugged in with landline the receiver comes on by itself because of the heat and then locks up as mentioned earlier. I have just about decided to go back to HD non DVR and move the HD/DVR into my home and forget it in the MH.
Over all, unless you can find some way to keep this "puppy" cool I would not recommend it, that's my story and I'm sticking to it!