Just my opinion, but if I were going to spend $6k on an ATV it wouldn't be one that was limited to 2 wheels. You would be extremely limited in use. 4 wheels provide stability and twice the "wheel to ground" surface area. 4 wheeled ATV's can also carry larger "less balanced" loads that you just wouldn't be able to safely carry on a 2 wheeled bike.
When calling coyotes, more often than not they will circle on a target they are
coming into and approach from the downwind side. Presumably they do this in
order to align what they smell, with what they are hearing.
This means that you should always have your downwind side camouflaged and have
an open shooting lane. If the area is heavily covered the coyote could come in
take a look and be gone, with you none the wiser.