In four years, I have only used my ERS once, poorly planned fuel use. I now know my truck capabilities better also carry an extra fuel can. For something that I actually use so infrequently (and always hope to never need) cost is a prime selling point.
Unless my next insurance carrier (shopping for same reasoning, I want lower premiums for something I haven't actually used in years and hope to not need to use) provides a full Roadside assistance program, including RV coverage, I will likely switch to the Escapees offering.