LBoyette: This works the best so far https://www.modland.net/farming-simulator-2015/implements-tools/conveyor-belt-set-v-3.2.9-2.html

works great for me,but I attach it to a Crasshopper

I will have to do some more experimenting with it, however, the only problem I see so far with this attachment is that it doesn' pick up at ground level. I've tried it with three different tractors and when traveling down a concrete silage lane, it leaves a center strip of silage that it won' pick up.

:)