[Montana Man]

If your trailer is riding at proper height at the rear you should have good clearance. You can actually fabricate a platform that raises upward creating clearance in which the trailer would drag before the platform. Whatever load you place on the platform should be fastened securely. There is not so much bounce that damage will occur. Think about it, what is in the back of the trailer? A couch, tv, a kitchen? Are those things being shaken apart? How could something mounted two feet away outside be bounced to bits? I've had two similar platforms and had no problems.