Is this a good deal on a Drobo?

[Kate]

Costco is offering a 5bay Drobo with three 2tb drives included for $800 (with coupon), they say this is $100 off the regular price.

Would this be good in the motorhome or is it really sensitive to vibration. I have several HDs mounted in the rig and they seem to do fine.

Also, could I add 3tb drives to this or are you limited to like drives.

Kate