The safety issues brought up is a good one. However, I know alot of customers over the years who were upset by the fact that they couldn't slow down lift speeds and drive speeds without a factory tech and blow it off. Freely available information and documentation would solve more issues that it would create.

I have been into dealers all over the US and I regularly see trucks of all makes and models and the proprietary systems don't stop much. The lack of information and support though do cause them to guess which is dangerous I will give you that. However, this could be solved if the big guys would take a bit of the original posters advice and be more open with their documentation and recommendations. The idea that they can keep people captive is not reality.