TO ANSWER YOUR FIRST QUESTION . ON OR OFF THE ROOF. WILL YOU PARK UNDER TREES? IF COLLECTORS ARE ON GROUND, THEFT OR DAMAGE CAN HAPPEN TO THEM . STORAGE ANOTHER. IT WONT RUN YOUR AC OR MICROWAVE. IF YOU WANT TO RUN AC,MICROWAVE OR 115 TV. YOU'LL BE IN THE SHADE PLUGGED INTO SHORE POWER MORE THAN LIKELY. THIS IS WHERE I MADE MY DECISION. I WENT TO THE ROOF. NOW THIS WILL TAKE SOME THINKING AND MEASURING. FIND A WALL THAT GOES FROM THE ROOF TO BASEMENT. THIS TAKES A LITTLE DOING TO GET THE WIRES TO BASEMENT.MAKE SURE YOU HAVE A CLEAR ROUTE BEFORE YOU DRILL ANY HOLES. If YOU HAVE A EPDM ROOF GET THE RIGHT SEALANT FOR IT OR YOU'LL RUIN THE ROOF. THINK ABOUT THE PLACEMENT OF THE COLLECTORS.CENTER IN ROOF LINE FRONT TO BACK OF MH. MOUNT OFF THE ROOF ABOUT 2" WITH A SLIGHT TILT TO RUN RAIN OFF. YOU CAN BUY TILT STANDS FOR THE COLLECTORS , I WENT HOME MADE FLAT STANDS ,BUILT IN SLIGHT TILT I DIDN'T LIKE THE IDEA OF GETTING ON THE ROOF TO TILT UP THE COLLECTORS FOR WINTER SUN. YOU WILL NEED A GRAY PLASTIC WEATHER ELECTICAL BOX WITH AN O RING LID. THIS BOX WILL BE USED TO JUNCTION THE WIRES FROM THE COLLECTORS. SEALANT UNDER THE BOX OR COLLECTOR STANDS BEFORE YOU SECURE THEM TO THE ROOF WITH SHORT SCREWS. IT WOULD ALSO BEST IF YOU COULD GET A ROOF FRAME LAYOUT FROM YOU RV MAKER SO YOU KNOW WHERE THE WIRES OF THE COACH ARE LOCATED.