I bought a used 1998 Logan Competitor (2 horse bumper pull) which I sent to be sand blasted and repainted last week. It was in pretty good to condition except an area around the windows that had some rust. Well I just spoke with the guy doing the work and he said I was going to need someone to shore up the area around the windows as the sand blasting had deteriorated it and I'd need it fixed (probably by a welder).
Here is a link to pictures of the trailer windows (not mine but exactly like mine) and you can see the type of windows it has.
SueCoo- My mom has a Logan Competitor which she just loves (and have had since 1998) BUT those double walls hold moisture. She just took it in to be looked at and they had to tear down the walls around the horse part and look at the frame. It was rusted out because the windows leaked the water down the double walls and the insulation held the moisture. Now, she has to replace the frame and several other MAJOR parts of the trailer.
Just FYI, maybe your guy can look at it just to check.
I have a Logan but it is single walled and has not had the deterioration that mom's had.