Shar wrote:Some travel trailer designs do use all flat surfaces: like the one I made. I like the idea of having the "skin" partly done already beforehand! Thanks for sharing about this product.

You are most welcome, Shar.
I also found this interesting comparison article of Polyiso, EPS and rigid pink XPS with very interesting Polyiso vs. XPS side-by-side microscoping photos on page 9 of the document:
http://insulation.owenscorning.com/assets/0/428/429/440/2f639b9f-590e-48b3-b25a-48e07e7fa312.pdf Although it is written by XPS producer it is still has some hard facts there and after reading it I think XPS is probably overall has a winning edge over polyiso foam for a small trailer foamie build.
Cheers!
Oleg