You can sometimes find these through Google. A search of 2008 forest River Lexington brochures gives me this, which leads to this for the 2008 Lexington and this for the 2008 Sunseeker, among others.
Good luck on the rest.
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Scott
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD