I think you might be misunderstanding that popup message. Granted, it is confusing in the build & price site. When you add a package that includes certain sub-features, but you have those sub-features already selected, then it lets you know that it will de-select those sub-features. It does that so you don't pay for the same feature twice. The other thing going on here is that adding Tow Technology is removing the removal of the scales and smart hitch, since it needs that.