your Shamrock(twin of the Roo) is built on an ultra-light frame and will NOT be able to safely tow a boat.
its bumper can barely support the spare tire.
if you do some research, you'll find that putting a bike rack on the back of an ultra-light trailer, is a bad idea. the trailer has NO SHOCKS, therefore the bouncing and bending that bikes held out away from the bumper, will cause, will shortly overcome the cheap welds.
and you'll find very few who would support trying to tow a boat with it.
the only way to do it is to have a welding shop, weld and brace a 2" receiver to the frame and bumper of the trailer.
doing this mod will void the frame's warranty, though.
so, it can be done but for me, an avid bicyclist, it wasn't worth it. i decided that other alternatives were better.
listen to Triguy, he has the same trailer.
but welcome to the Forum and be sure to post in the Shamrock sub-section, under Expandables/Hybrids.
and remember the more popular Roo is an exact twin of the Shamrock. so, you'll find a lot of 233S Roo owners that can help and suggest mods.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC