TrailManor vs RoadTrek

We are considering getting an RV for the first time. We are looking at RoadTreks and TMs. A RoadTrek is a self-contained "van" with bed, shower, kitchen, etc. The obvious problems are they are small (but easy to drive) and don't allow you to have a separate vehicle to drive when you reach your campground. The disadvantages of a TM are towing, backing up, leveling, set up, etc. when you arrive at your campground, but much more room. We would like to take extended trips - perhaps up to a month at a time and would be going primarily to National Parks.

Any thoughts on pros and cons from you experienced RVers would be very helpful.

Thanks,

Susie and Bill in the Rocky Mountains