Here I have converted the original Kroger SRB 35 semi-trailers. Since the additional optical coupling was not as successful and was a little too cumbersome to use, I have the originals rebuilt and have grown a ball hitch and a normal towbar. So you can hang out with Dolly several SRB 35 together. Unfortunately, he is only allowed up to 40 km / hr. At higher speeds, the handling leaves something to be desired. Everything else is like the orignal.