If you are going to do short trips, strap it down hard and compress the suspension for the reasons Tom mentioned. Use cross straps on the rear to keep it from walking around. I plan on towing mine for 10,000 to 20,000 miles so I strap the wheels with bonnets so as to not wear the suspension in one area. I made tie down points on the front and back of each tire. The trailer has a winch which I hook to the front tow hook and permanently mounted wheel chocks. The guy I bought the trailer from used just the winch and set the parking brake, yes there are people out there doing stupid things.
Mike