Because they're so different than cars and pick ups, I don't think running without collision insurance is a good plan either. On a coach the age of ours, due to hard to find parts (or non existent) and expensive labor, it's not going to take much at all to total it. Insured, I can hopefully recover enough to be back in business with a minimum of financial stress.
Without collision, it wouldn't take much of a collision to have a totaled coach that's worth very little - unless I wanted to spend a small fortune (likely more than it's worth) to get it repaired.
That said- I do go with a high deductible to keep the policy reasonable.
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake