From CPW - "The use of trail cameras is legal. However, once you hook a camera up to or sync to a device, it is no longer a legal method of use. Colorado prohibits the use of trail cameras that use the internet or other computer-assisted remote technology while hunting or fishing."
I would highly recommend using a security box and locking them if you're using them on public land. For blinds and tree stands, all I can say is good luck. There are a lot of people out there that will do anything from destroy them, steal or use where they are.
I think it's better to carry in a lightweight climber to use and take it back out. I know it's tough to find them much under 20 lbs but I would really worry about a stand I put out there.
You can also go with a Tree Stand Buddy where you only leave the bracket on the tree and just carry in the seat and platform, hoist that section up to the bracket with a rope, climb tree steps to the right height, insert them and pull the straps tight to the tree.