Tbh it's usually fine without even locking the wheels. If I need extra stability for something demanding I can lower a couple of feet at the rear, like this (only one lowered in this photo)Thats a neat idea for blade storage, how solid is it when in use with wheels locked.
![20211027_161822.jpg 20211027_161822.jpg](https://cdn.imagearchive.com/ukworkshop/data/attach/101/101590-20211027-161822.jpg)
When I built a low-loader style base for my P/T (iTech 260S) I didn't even bother with locking wheels; it too is absolutely fine. It takes a lot more force to move either of these machines than I'm ever going to apply to a workpiece. Having a wooden floor probably helps; your mileage may vary