I'll be honest.....I've never used a trailer, but I think I have enough RV experience to know that I would never want one.
For those who do not have a diesel pusher, weight quickly becomes an issue between the weight of the toad and trailer.
For those who say they rarely unhook, what happens to the trailer. The majority of campsites are back in sites. So now you're 20' of trailer is an issue and you are no where near the utilities. I think looking for a pull thru site everywhere you go would be a pain.
Many are saying that putting the car on the trailer is no big deal, but are forgetting to add that you have to hook the trailer to the coach. To me, that's double the work.
I'll admit that initially installing my tow gear takes some time, but after it's installed, it's easy to connect and disconnect the toad.
Lastly, the trailer needs to be licensed, insured and maintained, again, double the work and expenses.