Hi Coleen
Difficult question only you can answer, but I offer these points.
Do you believe yourself and hubby to be in reasonable health, and do you keep well?? At home would you expect to visit the doctor in say the next 28 day period ??
If one of you should fall Ill would you be ok staying in your van until he/she is well ??
How would you get your Van home if you couldn't drive ?? Do you have friend or family who could pick it up ??
I do believe the French health care to be of a very good standard, and I believe that you can get very near full cover being pensioners.
http://www.e111.org.uk/cover.html
At the end of the day it's your choice, and I would weigh up the cover against the insurance cost.
Personaly I am happy with the E 111