Took some research when I was trying to replace the gas struts on the front roof of my T21TBHW. Model number usually contains force (in lbs) such as 40 or 60. It may also contain minimum or stretched length - the other 2 critical measurements. With force and the 2 lengths, ordering struts is easy.
Anything mounted to the sides of an A-frame that applies any force has to be through bolted with a backing plate. With machine screws and nuts, the mount and the backing plate clamp the wall between them and spread the load. Flagstaff/Rockwell just screws into the side - these will NOT hold in the long run. Also any fittings (strut mounts) on the outside need to be caulked to seal out water. If the nuts are visible, using acorn nuts can avoid cuts and scars and will improve appearance.
Fred W
2019 Flagstaff T21TBHW A-frame
2022 Kia Carnival minivan
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