Thanks. You gave me a lot to think about in consideration.@#R_TST -
Not a dumb question at all. There are so many different aspects and details to literally everything. It's a great question.
It is wise to prepare in advance and have a blueprint in place so you have something to follow, the better you plan things out, the less hiccups you will have along the way. The idea is to plan for the issues and solve for them before they arise.
The caster-wheel option is a good option, but how confident are you on making 100% sure that you are able to install them properly, to the highest quality that is needed? Stands aren't what they used to be, so the one you have may be merely particle board of some sort. Do you feel comfortable with your new display parked on wheels? Have you thought of the price, quality and type of materials that you want the caster-wheels to be made out of? A good set of caster wheels may run you around $250.00 - Aim for wheels that will hold twice the weight of your display, which is around 300 LBS, so look for a weight support capacity of 600-800 LBS that boast double ball raceways.
In reality, a display system should never be moved if possible. This always holds the possible risk of compromising the integrity of the system overall; seals, braces, etc. However, moving a system is not rocket science, remember, "solve for the issues, before they arise." Technically, you could do a 80% water change and move the system with 20% of the water remaining in the display. This amount of weight is much more manageable with 2-3 individuals.
Simply put, moving your display would go quite well without an issue. Are your floors carpeted, tiled, hardwood, laminate or vinyl; these materials would all play a part in the moving details. Also, the materials would decide on the small detail of 'Locking' caster wheels.
Either option is a viable one and very doable at that. Which one would you prefer?
A) Mount Permanent Caster Wheels
B) Move With One/Two People