Structurally yes, the inserts could be mounted as you choose. Which you proved as you mounted, what most would consider backwards, and they didn't fail. However the task of resisting a certain force dictates orientation. Which you also proved, you camper wasn't being held
Re-mounting the inserts with the tiedown plate pointing forward, increasing the tie down angle should help alleviate and hopefully solve your camper walking backwards.
Ive several Torklift products, some of the best on the market I think but I would agree, in my opinion, that some of thier instructions manuals are the weak link. I've no qualm reimagineering a product to make it do what I want it to but was the manuals that needed the most refinement.