If I was going to plant Hay, Oats, or Wheat today; It would be with a broadcast spreader, & a good harrow. Timothy, & clover would be fine broadcasting; but You probably need to spread the Timothy, & Clover together; then go back & do the oats by themselves. I like to use a tractor with oversized tires, & light weight for broadcasting.
If You buy 5, or more ton of fertilizer in a furnished pull type spreader they probably wouldn't object to using their machine to spread the oats with If You have a lot to spread. Especially if You need several loads of fertilizer.