Pros and cons of a rabbit tractor

My bunny had babies about a week ago and I don’t have a grow out cage for them. What are the pros and cons of have it a rabbit tractor on the ground? I know that there is something going around which can kill rabbits which is why the farm that I bought them from would not let me go inside their rabbitry.

Some things that come to my head right now.

Pros
Fresh grass
No poop to clean up

Cons
Can get diseases
Wild animals can get them
If not secured at the bottom can burrow.

This just what comes to the top of my head. Looking for more input on things I am leaving out.

fleshing out the cons:
harvesting the poop is harder if that's important to you
needs to be moved every day-ish for fresh food
bottom needs fenced to keep out predators and stop them from getting out.
Depending on your area the rabbits can pick up diseases or parasites.
You'll need some shelter for sun and weather, and if you have heavy rains and flowing/standing water that's not optimal.

But rabbits do enjoy being out in the grass. Not sure where you're at or what the weather is like right now, but it's a great way to vary their diet and give them something fun to do. It also gives them more space if you need it.

In Morgan hill ca. USDA zone 9B. Not looking to harvest the manure, that’s what the breeding stock  is for and the goes into a worm bin.

Just be careful and start them out slow on the greens.  We feed them for about a week slowly adding more greens and then put them out in the tractors.  We move them everyday so they won't dig.  Our tractors are 4ft x 8ft.  Half covered.  We only run them in the summer here, so they need to be able to get out of the sun.  We like to run our cal/new zealand crosses and Florida white/new zealand crosses in them.  Heat is our biggest enemy.  Moving them on a rainy day is a pain in the butt. We have never had a disease problem.  We follow them up with the guinea fowl to clean up the bugs.  We have never had a tick.  It works good for us.