Whatever you do, do NOT tie the airframe directly to the trailer. Use tire straps to hold the tires to the bed of the trailer. Let the tires and spring gear cushion the airframe just the way they were designed to do. For a approximately 700 pound aircraft use the lightest trailer you can find. Trailers made for 4000 pound cars have way to stiff springs for a KR-2(s).
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net