tough decision but being 71 understand your worries about breakdowns.
we decided couple years ago to try other options but still enjoy truck camper. we have gone to some nice state parks and rented cabins and really enjoyed them. cook outdoors-have fire ring-plenty of hiking trails-and when adding cost into about same as truck camper but without the up keep. Just got back from Nova Scotia and nre brunswick area without truck camper for three weeks. really missed tc.
Oh well as long as you got your health and each other I'm sure you will enjoy your new adventures--Have fun