I've generally gotten there on foot; as others have said, very often the trails I want (or at least choose) have trailheads in or very close to the campground. Sometimes I take my bicycle.
A lot of people do pull towed vehicles behind their motorhomes. A lot of other people do not, despite the prevailing opinion here. Every now and again when traveling down the highway I've conducted an unscientific "poll" of other motorhomes I encounter on the road, and whether or not they have a towed vehicle; and generally it's ended up somewhere around half with and half without.
