I think you'll love your Trav'ler! I see it on so many RVs every time we camp.
As to installation, I have installed a Trav'ler (the same one) on 2 RVs now. On my XLR, there was nothing pre-wired. So I had to pick a spot and drill a hole through the roof for the cables. I'm a handy guy but it was a little scary drilling a 3/4 inch hole in my roof. I drilled from the inside out after many careful measurements. Other than that one hole, there was nothing challenging about installing the Trav'ler. I used the proper self-leveling sealant and followed the directions. It took me maybe 3 hours and I was extremely careful and slow. See this thread for more details:
New 35x12 & Trav'ler Dish question
When I traded in my XLR for my Cedar Creek Silverback last month, I removed the Trav'ler from the XLR and installed it on this RV. The pre-wiring made it a snap! I'd say it took me about 45 minutes on the roof. Basically, you just find a spot where it has the proper clearance and is within 3 degrees of level on your roof. You squirt the sealant in a ring where you will place the Trav'ler. Then you place the Trav'ler and screw in 9 little screws. Then you place more sealant around the lip and screws and it's installed. You bolt on the dish itself at the end. Hardest thing is getting the thing up to the roof to work on it. I used a strap & my wife and lugged it up carefully.
The pre-wiring really made my day. On the roof of your RV there is a little label that says cut here for Trav'ler cables (or something to that extent). I carefully cut through the label with a razor knife and fished out the 3 cables -- the control cable and 2 coax leads. Most likely, your best mounting spot for the Trav'ler will be within a few feet of that location. The cables all fit right in. I never had to drill anything and that made my day. Inside the RV somewhere, you will find a cover plate that is labeled Winegard control cable. Mine was in a closet in the nose. That is where you place the control box -- there's a plug nearby too. Then you have coax lead at each TV labeled satellite TV. My pre-wiring supported 2 TVs -- the Trav'ler itself has 3 coax leads so maybe there are 3 leads on a large RV? You can't use a traditional splitter so each TV gets a separate lead.
By the way, I believe Camping World says they will install anything (including a Trav'ler) for something like $89.
I can take a picture of my installation if you are thinking about DITY.