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You know Lil, although I would be the furthest thing from a guru on this board, I was seriously considering having that done as well. Like you, I also have a LWB 56 250. I am definitely having the inside of the bed done (before I put the southern swamp cypress bed in!!)
If I wasn't going for a complete resto, I have had the entire bed and wheel wells done. I would of gone with Line-X because I think they have a better product and the color options are endless. I know you said cab but you could even do the running boards in the black stuff and it would stay durable. - Just my two cents.