Hi dday, I have a couple thoughts. First and foremost what kind of truck are you restoring?
You do not have to tell your wife that you want more then friendship, she knows it. She's your wife, she knows your into her and want a complete relationship with her. She does not want this now but she knows you do, so there is nothing to say about it.
Fogg's advice is perfect. There is no cookie cutter strategy for you. Take some from column A and some from column B. It depends on what the marriage was like before, vis-a-vis your pattern of behavior. Don't do what you did in the past.
Detachment from your wife builds on itself. It is like a ladder. Your in a hole, jumping to reach the edge but its to high. Someone lowers down a ladder. Do you step on the first rung and jump for the top, no, you climb up one rung at a time. Detachment is like a ladder, it builds on itself.
So get on the ladder and climb up and that little spot of blue will get bigger and bigger until it covers the whole sky. This is how you get your wife to seriously reconsider a life with you. By being strong for yourself, displaying confidence, depth of character and a kind and compassionate nature.