I got nervous, I was looking for a pic of the Goldstar unit but I couldn't find it on the net. The only hits I got were from the Lowe's website and it said that it was no longer available. I built my trailer specifically for this unit. Any other unit would require revisions. I went ahead and bought it today. I'll post pics with dimensions tomorrow. BTW it is a Goldstar GL-5004
edit: Here are the pics"
<img src="http://www.geocities.com/moshead2002/P1220182.JPG" alt="" width=480 height=360>
<img src="http://www.geocities.com/moshead2002/P1220184.JPG" alt="" width=480 height=360>
It protrudes on the inside a bit but I'll take it since it isn't very deep in the back. It is also quite close to the ceiling I hope that won't matter. Now I'll mock up the ducts with cardboard.