Same issue, but our unit came with no means of latching the, under the sofa, drawer in place. I tried 3 (rather beefy) magnetic latches, which worked fine as long as you did not have anything heavier in the drawer. But we keep the table top and the "pipe" table stand, along with the sink cover, in that drawer. With those in the drawer, the drawer still kept sliding out.
Since, then I have modified a more positive latch.
As built, and freely sliding out during travel :
Modified with a magnetic catch (pardon the scribbling) :
Here is the latch :
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1