We used ours a bed for several years, no supports, just did it as you were told. No problems and it was the most comfortable bed in the trailer.....after a egg carton topper was put on it.
"Next to prayer, fishing is the most personal relationship of man"Calvin Coolidge
"American by Birth, Southern by the Grace of God"Lewis Grizzard
2016 GMC Denali 3500Dually--2017 CC 36CKTS