I have modded many seats to fit better, added lumbar, more side bolstering, etc....luckily for me and my wife they fit us so well we do not need to do anything, it helps they go decently low, I do not like sitting high up and have modded sets that have lowering to go lower. I have changed seats in a bunch of vehicles as well, cars and trucks, quite a few sets of Recaro seats to replace stock ones, race seats of a few brands, etc...and these still are so perfect for us, a great blessing......we can just use them
On really long drives the 10 way seats with much more comfy custom leather in our dually is nice though, just a tweak here and there to relieve any stress points, 1150 miles with one 30 minute stop is my record and could not do it with any other seat, not even the FiST but it is our site seeing, track day, etc car so will not go on long drives, it will be in the trailer during those times getting a free ride)