Many trustworthy sites across the web allow you to download free GPX files that can be uploaded to TRX Trailhead so that you can ride these trails using your TRX7.
Some good sites for downloading GPX files include:
- https://www.trailsoffroad.com ("...guides for over 2,000 trails in the United States, reporting on the conditions of those trails, and updating them four times per year...")
- http://www.jeeptheusa.com (Arizona, Colorado, New Mexico, South Dakota, Utah and Wyoming)
- http://www.traildamage.com (Colorado, Utah, California, Arizona, Texas, and Wyoming)