I've found that the Realtree EZ-Hangers that are sold in different lengths work very well for resting a rifle on. If you want, you could place one on either side of you, and with the folding arms of the hanger, you can get a pretty steady rest out of it. When not needed, then just fold them out of the way. I use the "long" version, but the 3-arm version would give you a little more flexibility.