good web site names based on keywords

Hello, just wondering if it made a difference when selecting a url if it included a lot of keywords:ie: if i were a plumber and wanted to be on the major keywordslumber, supplies, new construction, heating. Would a good url be:
www.newconstructionplumbingandheatingsupplies.com
or
www.new-construction-plumbing-heating-supplies.com

I dont care about having to give my url out, I just want to be found when people do queries.

Would these names be a neat "trick" to get more exposure to the keywords I want. Is it better to have the "-" between words, or is my idea a dud?
thanks in advance

This is something you should be discussing in one of the SEO forums like http://webmasterworld.com or http://searchengineforums.com , not here. This forum isn't here to help you optimize your site for maximum exposure.

Not an original idea. And (because of the reputation prior practitioners have earned) it would be type-casting for a pretty slimy crevice of the gene pool.