I installed the bolt down dash mount after getting tired of chasing down my GPS unit. I started with the stick down that lasted only for a short time then I went to the rectangle weighted base. None of those worked for my Class A dash. I ordered the bolt down then went to work. The unit bolted down nicely, it was the dismantling of the dash that was time consuming and tricky.. to reach the top of the dash where I installed my mount I removed the parts of the dash that held the radio and chassis air conditioning controls. Once I got that apart I was able to get my hand up under the dash to hold the metal backer in place and also hold a wrench on the nuts for tightening. So, if you are not mechanical inclined, take your unit to someone that is to have the mount installed. I hope this helps the next person considering this mount. I personally am very happy with. It is now mounted in a location that was meant for it and I don’t have to reach for it now when I need it at critical times like driving through Dallas or Atlanta. Good luck and have fun.