Stormy, it can be done, and probably fairly easily. I have done such a
project. What you need to do is cut an opening in the very top of the
two end walls at the highest points and look in and see exactly what you
have in there. The one I worked on had about 3/4" at the most, and
absolultely none in spots. We got about 25-30 feet of 3/4" pipe to use
as a handle and taped the insulation blower hose to it. The guy stuck
the hose into the opening as far as it would go, and slowly pulled it
out, while moving it side to side to try and get as even coverage as
possible.I am sure they were not able to get 100% coverage, but they did
manage to get quite a bit of insulation blown in. I don't remember
exaactly how many bags it was, but it was a bunch. I made a HUGE
difference in heating and cooling. I hired that one done for $300 about
8 years ago. I am working on another one right now, and am going to try
to do it myself. I already checked and it also has nearly no insulation
there now. (about a 1972-3 14X66 approx) The only thing I am
planning to do differently is to use fiberglass instead of that chopped
up newspaper they call cellulose insulation. The fiberglass is much
lighter, and will not grow mold if it ever gets moisture. Both of the
ones I am talking about are over-roofed with "R" panel, so leaks are
less of a worry on them. The over-roof also helps on cooling greatly,
which is the main concern here in S.Tex. BTW, I have already checked
at HD and Lowes, and the only blown-in insulaion they sell is the
cellulose, and will lend the machine free with the purchase of the
insulation. I found the fberglass at a regular lumber yard for about the
same price, but will have to see if I can find the machine to rent at a
rental yard-- can't imagine it would be that expensive. Good luck.
Larry