I did use treated wood for the bunks and side planks as well. But I had that treated lumber bought at least six months before I actually used them. They were laying in my shop flat on the floor. Then a used stainless steel carriage bolts and counter sunk them and filled over the holes to give a smooth surface. I also applied two coats of 50/50 polyurethane clear and mineral spirits on the cut and rounded over parts. Then I allowed those coats to dry and applied primer and two coats of enamel paint before glue and carpet with stainless steel staples. Sounds over kill, but the do last a really long time.
Bruceb, Two things you can do to limit your exposure to most anything like the chemicals used to pressure treat wood. First do all the cuts and round overs out side. Secondly, use 3M 6700 filtration mask. Easy Peasy JMHO!