are coupled by a pin 292 to a cylinder 294 that provides rotational movement for the first rod 270 about a first horizontal axis the first rod 270 and the second rod 272 include fixed portions 296 and adjustment portions 298 the adjustment portions 298 provide length adjustment along the v direction shown in fig1 for the first rod 270 and along the h direction for the second rod 272 for the first rod 270 one of the fixed portions 296 is fixedly attached to the cylinder 294 while another of the fixed portions is fixedly attached to a cylinder 300 for the second rod 272 one of the fixed portions 296 is rotationally coupled to the cylinder 300 to provide rotational movement of the first rod 270 about a second horizontal axis once placement of the frame connector 268 is determined the resultant angular orientation of the first rod 270 can be secured with tightening of a set screw 302 threadably attached to the cylinder 300 an alternate implementation of the rear frame connector assembly 106 is shown in fig1 as having a top cross member 304 sized to fit over a bottom cross member 308 such that holes 308 in the top cross member align with holes 310 in the bottom cross member to receive pins 311 thereby securing the top cross member with the bottom cross member the bottom cross member 308 further includes saddle connectors 312 to straddle the rear frame portions 16 having an outside plate 314 with holes 316 for insertion of bolts 318 to secure the saddle connectors to the rear frame portions the saddle connectors 312 each further have an inside plate such that when each of the saddle connectors straddle the respective.