Also consider geography when you select a vendor for something this size.  I tend to work with Activated Designs because they've always provided great products and they're also only about 1.5hrs away.

For large mechanisms they have just had an employee or courier drive them up to me instead of crating and sending via freight.  The one time I had an issue with an in-ceiling flip down they just had a tech drive up and fix it onsite while in place... having to remove something like that and ship it back would have been lots of effort.

I also work with Future Automation for the infrequent times when Activated Designs doesn't have a solution for what I need.