We looked at the rent versus own option, and for us, owning was much cheaper.  You can purchase a new and decent 21 foot travel trailer, for under $20k.  Bonus if you can pick one up a couple of years old.

If you already have a pickup, all you need is the tow package if you don't already have one.

This is much, much cheaper than renting. We "paid" for our travel trailer, versus having to rent, in just a couple of years.

We still tent though, as many sites on the "road less travelled" are simply not accessible with a big rig, or if you are towing.