Why couldn't you put all that on a monopod? If you think it looks silly, might want to have the vanity levels checked
You could never be mobile enough on a monopod as you would be with a shoulder mount.
A shoulder mount is much steadier then hand-holding and will allow you to move much easier while recording.
As it has been said if your arms were getting tired, your rig was never properly balanced and that defeated the purpose of it.
Ideal balancing means you can lay the rig on your shoulder and not have to hold it up. This gives the most stability.