We used the 3M tape on our project. It is pricey, but very easy to use compared to liquid adhesives. Three years in nothing is lifting. The only trick to a good application is a good clean surface to adhere to. My advice is to stick it right to the bare metal in the wall structure once you get it clean and free of any rust. If you paint the posts first, you are only sticking to the paint, so the result only has the adhesion of the paint to the metal, not the strength of the tape. caf is correct, once you stick it down, it is stuck. The trick is lay out all your tape on the trailer side first, and just peel back a bit of the backing and leave it hanging out where you can grab it. Then just carefully hang the panel on those few exposed spots, then pull the backing out one and a time and smooth as you go.
We went the paint route on one trailer. More work than you think, there are a LOT of square feet compared prepping/painting a car. Looked good across the parking lot, but up close you can always tell it's a repaint. Reskinning is still more work, but worth the effort if you think the trailer is worth the investment. If the trailer is fairly specialized to your purposes, may be worth it. If it is just a square box and nothing special options wise, you may be farther ahead to invest the money in a newer trailer instead. Check racingjunk.
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