2 newbie questions - stability and bug control

you need to get tandem wheel chocks next, if you don't already have them.
most owners will get most of the movement out by using these along with the stab jacks.
but remember, this is not a house and having active kids moving about, will guarantee that getting all the movement out is impossible.

by the way, in case you don't know, there's a Hybrid Forum here with lots of Roo/Shamrock 233 and 233S owners that can help with any questions or mod ideas.