There are some really great things about a 5r, but we went the other route for our last 3 trailers. Travel Trailers.
MY Cons against a 5r:
We prefer trailers all on one level
I have two bad knees and a bad back. Need Low steps...
My wife has bad knees.
When we camp it's just the 2 of us.
I actually use the bed of my truck, so a 5th wheel is in the way.
We don't have to carry everything we own when we go camping.
My current camper is 20'. It fits in every camp ground.
We have spent years simplifying our camping, so we don't generally carry things we don't need.
AND... Being retired we prefer to camp during the middle of the week.
When I show up on Mondays the campgrounds have lots of empty spaces.
Camp grounds like to see people leave on Fridays so they can fill up on weekends.
Lastly towing a 20' is a breeze.