suggest you read through posts in Expandable/Hybrid section. lots of info about the tent ends and things to watch out for.
you'll find more that way, instead of waiting for other members to post.
the bunk ends can handle 1000-1200lbs. of weight.
the Shamrock is the twin of the Rockwood Roo, which is a much bigger seller than the Shamrock, so all Roo posts will apply to Shamrocks.
RVW has videos on how to open and close the bunk ends. any of of the Roo hybrid videos are good to watch.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC