Pomkai -
If you do a little research, you will find that there are quite a few differences between auto/truck insurance and RV insurance. Different needs for different vehicles. And different needs for different uses of the RV. Now, I am not addressing the Emergency Road Service insurance in this case.
There are several "specialized" RV insurance carriers "out there". Probably the most seen and used are Progressive, Geico, and Good Sam. Within each of their policies, there are items which can be covered or not covered. One can also add the RV on their auto/truck insurance, but one does need to be aware of the limits.
When we purchased our fifth wheel, I looked at all this insurance stuff. As a decades-long customer of State Farm, I inquired about their coverage. However, to cover our Alpine, we decided to use Progressive. The reasons? Discounts for "days in storage", cost, some pet coverage, living expenses during repairs on the road, other benefits. Also, in a couple of years, we plan to full time, and there is a separate Progressive rider for covering full-timers that we preferred over Geico, Good Sam, etc.
Everyone has different needs, so I would encourage you to look at the companies and find what fits best.
Ron