For full size bikes. I have a couple of options on where to mount the chocks on a 6' wide, 16' long trailer. Considering two side by side facing forward, two facing sideways in the same direction, and two sideways, facing opposite directions (this seems like it would be the most compact/ efficient). From prior experience, seems that a 4' wide trailer is almost too narrow for two large bikes side by side. 5' is about right. 6' is overkill. Based on this, seems that an allowance of 2.5' per bike is about right. lll Seems like no matter how I mount them, I'm dealing with about a 6'x6' area. Might save a foot (i.e. 6' wide, 5' deep) by going with the opposite-facing option. Using popchocks, BTW. Thoughts?