Like Ron, I would not travel without ERS, especially with a Class A MH, are trailer tires easier and safer to change than a MH ?
We have Coachnet for RV use, but our AAA Plus will cover some RV towing and our insurance is with Foremost that also provides some towing benefits.
Unless, you think you can handle roadside emergencies on your own, I would invest in a ERS Policy. You will have to compare the benefits offered ans select the policy that's right for you.
ERS provides some piece of mind.
Best of luck.