I was leaning toward the Spring Tie until I
realized my ladder was in the way. So I got the HiTie's due to them being
able to mount "up and down"
The guys at the trailer manufacturer gave me a
great tip on how to mount stuff on a smooth sided trailer (if it has steel
supports) and that was to use a magnet! I put a swatch of polar fleece
under the magnet and slid it around until it stuck! Works better than any
"stud finder" I have ever used in the house! All of my old trailers are of
the stock type and had exposed studs.....pretty easy to find. I put
in 2 HiTies and additional tie ring along with bucket hangers and hay bag
hangers.
Karen's link I found by "googling" HiTies,
and the comparison page came out. Very informative.