We ride recumbent Tadpole Trikes! We are just retiring and plan to camp and ride the trikes all over the country.
http://www.terratrike.com (there are also other brands)
Two trikes could be stowed in your Jeep Liberty.
We have two Terratrike Cruisers (look like the Tour II model) and they both would fit in the back(hatch) of my Nissan Xterra. I put one in front wheels first and the second in Rear wheel first.
We absolutely LOVE riding these things!!!

Picture was taken at Niagara Falls, Canada
I will add that there are wonderful paved bike paths all over the US -
http://www.traillink.com/