Peggy, considering the Spyder is just over 8' (105") and the Road KIng is right at 8' (97") it would take a pretty good sized trailer. I would load the Spyder first. Driving it on would be better than backing it on. Either way, you would have to lower the back end of the trailer for clearence. If you loaded side by side the trailer would have to be at least 10' wide. Lots to think about.