As gkainz said, our Laredo also had full under-bed storage but it was a non-slide bed & much smaller/lighter FW than yours.
I'm guessing it may have more to do with your floorplan design than an attempt at "cost savings". Chances are they're trying to discourage owners from using that under-bed space as storage.
Bed slide-out mechanism aside, the 329RE already has 3 (of the 4) slide-outs, the kitchen appliances -AND- the full bath on the streetside of the RV. With the table/chairs option (IPO the booth),
that's even less counterweight in the curb side slide-out. Granted, I'm not an engineer
but maybe they're trying to discourage what could (possibly?) become a balance/weight/overload issue.
Just some food for thought.....
Terri, the Chevy co-pilot