Our RVing is for competing at sheepdog trials where we spend hrs sitting and watching the dogs run. This means we have the opportunity to try out lots of different chairs brought by all the other competitors. Last year we tried out an older model Strongback chair and found it to be the most supportive for the back of any chair we have sat in.
The model we sat in is no longer available so we ordered a pair (don't recall the model) from LLBean and hated them (returned them). The we ordered a pair of the chore and they were close. We did keep them but we also ordered a pair of the elites which we love. They are pricy, but cheap when compared to the back pain we were having sitting in other chairs. At most trials others will try out our chairs and ask where they can buy them.