I'm assuming we're talking about stake pocket tiedowns here?
I have a set that I scored mere hours before going to look at the TC I ultimately bought. Otherwise I would have had no way to tie the camper down for the trip home.
I had planned on using a short ratchet strap between the tiedown point on the camper and the stake pocket tiedown, but they were so close that there was no way that would work. So, I tossed a 2" load strap over the roof, front and back, and snugged them up against the tiedowns.
The camper did not even so much as wiggle on the trip home. No lifting. No pulling on my bedsides. Granted it's a popup, but I would have expected SOMETHING. I was resigned to some sort of bed damage, but nothing happened.
...and the outer fenders on my bed are PLASTIC, so the rails are only about 1/2 strength of a normal steel bed rail of the same era.