I.  PLANNING QUESTIONS

I live in an area known for seismic (earthquake) activity.  How do I factor that into my tower selection?

II.  Installation

Should I use oxidation-prevention grease on the sleeve connections of the tower sections before assembling?

I would like to avoid having to dig my hole any deeper than necessary.  Instead of digging my base hole about 3.5 ft. wide by 7.6 ft. deep (example), can  I just dig a 5' x 5' hole, since it's about the same volume of concrete?

III. OLDER or SECOND-HAND TOWERS

I am considering selling/buying a previously owned Heights tower from another owner.  How can I find out correct specifications, the adaptability to current products and the general new sale price of similar items ?   

I have an older model tower that I bought or someone gave me without identification.  How can I tell which brand it is, and whether it is one of yours?

I have an old tower.  Can I sink the tower section in the base, instead of buying a base

IV. General Design Questions

What type of base should I purchase with my tower?  A Hinged Base or a Fold-Over Kit type base?  What are the differences?