Foldback: I set ours on 4.5; any more and our 5er brakes get very touchy. We, wife/I are nearly paranoid with leaving extra room and coasting as much as possible when needing to slow. We (wife also pulled 15-20K lb trailers in our construction business as well) have had a very good safety record over the several decades dealing with questionable drivers on our highways from ME to MT to TX.
Jack
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