So just wondering, but wouldn't using a XTSL cover on a RXT be the same as using a custom cover? :duck: I mean, the attachment points are different on the two seats and as people have pointed out the XTSL cover is noticibly baggy on the RXT, blocks the booster belt path, and is unable to use the snaps to secure the cover. While technically they are crash tested, it is on the XTSL, not the RXT which has some structural differences.
I know people swap covers from Britaxes and such but I am assuming that there are not major differences between the generations to allow this (honestly I don't know, the only Britax I ever had was a garage sale find I got for the BRU trade in). And before I knew better I had an extremely thin PUL cover on my seat and it was super snug, so it never occured to me that it would be a problem.