I'm looking for a flexible/cheap way to use my three lengthwise floor mounted E-tracks in my 24ft trailer to haul bikes. I'm already setup for a couple of race bikes with Baxley chocks, but when I take my kids riding I need to tie down five dirt bikes and a three wheeler. Three 50's, 85/105, a 125 and a 200x. I've just been strapping them down, but would prefer to have the front wheel more secure in a chock. The cheaper options I see mount a chock in between the lengthwise rails I have on short pieces of e-track. Since the size of the bikes is going to gradually increase over the years, I'd rather not permanently mount anything in the middle that will not fit later. I'm looking for something that would let me attach a normal type chock to the lengthwise rails and be movable. I've thought of just attaching some cheap hoop chocks to pieces of 3/16 steel with some slots so I could fabricate something that would drop in the track and hold the position. It seems like what I'm looking for would be readily available but I just don't see anything that would let me attach a chock the way I want to. Ideas?