I have a removable and non in my trailer. I've seen people mount them where they had slack in the floor mounts and they rattled and didn't seem to want to stay down. I spent a lot of time measuring and drilling to make sure mine was the way I wanted it. Works really good. They send big washers to mount them just in the plywood floor, but I went ahead and bolted the mounts to a cross-frame on the trailer... it isn't going anywhere. I mount my bike down mainly with the rear straps and put the front on just snug in case a rear comes off. With the Pingle chock and just rear straps the bike is rock solid. I bought the wide chocks so I can put bikes in backwards if need be. The only thing I wish I had done diffrent is buy a Bexley (think thats right) motorcycle chock. You can take them out of the trailer and use them as a bike stand. They actually clamp onto the tire and hold the bike upright, which is what I need for the track bike. But, I had already bought the Pingle chocks and put them in the trailer. The Bexley Sport Chock cost about $200+.
