1. What type of truck or trucks are you talking about?
2. Most important to teh operator is the effort required at the rim of te hsteering wheel or the handle on a tiller.
3. Most manufactuers try to reduce the number of revolution from lock to lock. On sit down rights msot are in teh neighborhood of 3.5 turns lock to lock. But it will very from company to company. Sometimes thsi info is published in product literature/spec. sheets - searching the websites for various companies might give you soem data.
4. Don't know any data sheet that list all companies or data. on this issue.

Sounds like you are gathering data for use by a legal counsel or similar group