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Silviares did a great job at clarifying my question request and came through.

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Thank You.

great!   good work.    i wonder, can i just close the other question? 
 im new at this.    THANKS!

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Helpful, clear information. researcher found out useful things I had
not in my internet searches! Many thanks!
-Nina

Silviares worked hard to answer a tough question and didn't give up.

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did better job than me in looking up the answer

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This answer has been most helpful.  The only information I'd been able
to locate myself was the 1:12 slope and the 36" width requirements.
The information about using a more gradual slope in icy climates is a
good point, and one I'd rather know before trying to manuver on a too
steep ramp in January.  Thank you for your excellent work

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Some answers take a little more time and effort and this person did
the work necessary to answer my question. Good job!

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Thanks.

Thank you very much

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Wonderful answer. Wonderful person. Thanks for your help!

Thanks for the quick help!!

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Well done, the answer was thorough and complete. Thank you Silviares,
you are an asset to Google Answers.

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The response was close to what I sought and was sufficient for me to
work out the rest by myself. Only the first link was helpful. I would
have preferred a complete solution, but this answer was sufficient
justify payment in full. I was very pleased by the speed with which
the answer was forthcoming. Previously I had tried "Ask Dr. Math"
without success. So, bravo for Google Answers and silviares-ga.
Additional comments would be welcome.

Howard

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Thanks a million silviares-ga. Your answer was very helpful.

Thanks; the clarification makes it clear what is really available in the area.

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Good research, solved our problem exactly.