I am wanting to add wheel spacers to the truck. I had seen quite few people talking about how their back axle is shorter and so they wanted to add a spacer to make it even. Well I am curious if this is all the trucks or just the hd's or what. It seems like I see it more when someone is talking about a hd. If it is this way with all trucks what is the spacer needed to even it up so that I could even it up and add more. I am thinking about an inch and half is what I want.