I was alittle sceptical when I bought these. All the options for tie downs seemed to be so expensive I actually thought about selling my camper. I didnt wana spend $500 bucks so I decided to try these. SO glad I did! I have an 08 250 and they fit perfectly! They even fit over the plastic rail protector of my truck.They go on in no time really and have good holding power. I have a cabover that weighs 1400lbs (have weighed to before) and she doesnt move. We also have a boat so I was worried about when I back down the boat dock if they would still hold when its so steep, no problems. Althought if you do have a boat, I would recommend you get your bed lined with Linex like me or at least a cheap truck bed mat to make the camper grip more cause even though these are stong, they might tourqe your bed if your camper tries to fall back at such a steep angle like that.I was also worried about my truck rail width from the inside to the outside because 250s are alittle wider in the front of the bed. I measured the rail of my truck at the front and it was just under 5.5 in. The camper holddowns are 5.6 in so as long as your truck bed rail is narrower than that it would fit.Also one thing that it does not say in the description but that is in the directions in the box, is that you will have to drill holes if you have a truck with a double walled truck bed like a 350 dually. It also says in the directions that you need at LEAST 2in between the inside edge on the rail and the inside wall (pretty much you need a 2in truck bed rail) this is very important or the the triaglular clamp wont have enough space. But other than that they are so ajustable I can't see any other fitment issues for all other trucks.Great product Brophy!