25+ year old trailer are not a problem importing into the US. Anything "newer" unless right from the factory MAY be problematic... depending on what state you are domiciled.
I see you are in Oregon.... yeah, look for something 25 years old or older, or brand spanking new.
Ten Forward - 2014 Escape 5.0 TA
Double Yolk - 1988 16' Scamp Deluxe