You pay a JBL price for these, but the quality is great.
This is the version if you install the wheels on the back side, and roll with the front on the top, back on the bottom.
The electronics on the bottom are completely unprotected, which is something they could've look after (the cover for the QSC KS118 does that), but othervice you couldn't ask for more.
If you want to store anything on it while in storage, you could think of making a roller board for the unit or multiple units stacked, and use the other cover, which goes on from the top intead of the front.