@100Acre - Have we ever discussed using adhesive on the rubber windshield trim? Some people lose them going down the road. I used door trim adhesive to stick mine down. The reason I used door trim adhesive is because I had a tube of it in the garage.
I used a tube of 100% silicone caulk on mine after putting it back on for the 500th time, no problems since.
I bought my 500 in 2014, when they first came out, and put a full windshield and rear panel on before it left the dealership. I've either trailer or hauled it in the back of a truck for 1000's of miles, 3/2000 mile round trips to Colorado in one year, and always leave front and back windshields in place, never had a problem. I have removed both once to check the gas mileage and to my great surprise it made no difference on my mileage when pulling it on a trailer at freeway speeds. I've never taken either out again.