Welcome to the forum Mike.
We've been extremely pleased with our 2010 Laredo, it's our 2nd Keystone 5th wheel. Our floorplan
(265RL, same as oldfamer) is a very similar to the 29RL, although 2 ft shorter... love the rear/corner
entertainment center.
The Laredo is a 'mid-priced' line, somewhat similar to the FR Wildcat if you're familiar with that one.
We compared the two brands, side-by-side, when 5th wheel shopping in 2009.
You asked about hot/cold weather use -- the '07 brochure doesn't give any info (that I saw) for insulation
factors, but does list the "Heated and enclosed underbelly".
http://media.rvusa.com/library/07_Laredo_FW.pdf
I have an '09 brochure which shows: Walls R-9, Roof R-11, Floor R-14, but (of course) the '07 may/may not
be the same - it would be best to contact Keystone directly if you want that info. I 'can' tell you though,
as of April 2010 (on full-sized Laredo 5th wheels) the roof & floor insulation more than doubled from the
previous model year, and a 35K btu furnace is standard. That may/may not be relevant to you
Our only 'complaint' is that our model doesn't have a Utilities Station, & DH really liked it on our previous FW.
Hope this helps, and good luck with your decision,
Terri, the Chevy co-pilot