Welcome to iRV2 .
Sorry that health issues are shaping your future .
Towed 4, 5th wheels during my first 15 years of RVing. Our main reason for switching to a coach , was DW's heath , limited mobility made the interior stairs a trial ; much prefer a coaches level floor .
For me the ease of set up , power levelers , ease of parking; in 25 years of trailer towing , boats, snowmobiles , and the 5ers . never got really good at backing up.
Much prefer driving our toad around, to driving the truck for groceries and other chores. Flat towing allows us to have the toad mobile in 2 mins.
Many posts in the forums that discuss all the + & - of both set ups . A lot of personal preferences involved.
EDIT: JM2CW. Coach is much easier to drive.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.