Can wheels be added to a Guardian case?

Are they built such that it would be easy and safe to add wheels?

If you want to add wheels you'd probably be better off with a lightweight luggage wheely strapped to the case. Adding wheels usually entails enclosing a small section of the inside case to hide the assembly; not something easily done after market.

http://tinyurl.com/238l6wy

The bigger the wheels, the bigger the obstacle it glides over.

They actually make these with bigger wheels than this one, too.