[joedoh]

I installed bed trim on a 65 C10 with the 3m tape and it was easier done than said. my cab was a custom cab so it had the trim holes, but my bed was a base so no holes. the 3m tape to get is VHB, which stands for Very High Bond, and it is a high bond, this is what emblems and trim are attached with on cars since the 90s. you can get different thicknesses on ebay but I got mine at the local hobby shop. you have to build up inside the trim with a piece of plastic so that the tape can rest on the paint without being seen, I used lexan (like plexiglass but very easy to cut) and attached a 2 inch strip every foot or so. you can do it the entire length if you like.

I went through several high pressure and brush car washes and the trim never budged, and its still on the truck 2.5 years later.