When I installed mine, I figured the 3M tape would not last long. I used the 3M tape and contact cement together. Every couple of feet and at both ends, I added a dab of clear silicone so road dirt and water wouldn't wash/knock them off.
If you look on Amazon under 12 volt LED's you'll see a bunch of them. There are indoor and outdoor strips. The outdoor ones say outdoor and have a little half moon bubble over them. They come in a variety of lengths. LED's come in many color/brightness spectrums too. I always buy lights in the 3500K range because they look the most natural and don't look white. You'll also find pages of 12 volt dimmer switches, with or without remotes, on Amazon.
On my coach, there are two passenger side slides. There is one bay between them that I can access without bending under a slide. In that bay, is the controller for my awning. I installed the switches there and tapped into the awning power, with a fuse, for the lights. I can easily reach in and adjust the dimmer. I found the remotes were problematic and didn't use them.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab