on the real subject though.. im gonna do the same thing here in a few years. i like the carts where u just clip your bag on them so ease of transfer from bag to cart when available. cooler on lower portion. speaker's mounted. ill mcaguyver mine to the hilt
I built a simple one to try out. I thought it would only last a month or two but it keeps on rolling like a champ. It is a file box from walmart that costs ten doll hairs. I added a set of used golf pull-cart wheels and a handle and haven't looked back.
Here is the other one I traded for. I believe Tanner and Irban built this one. It is close to or the same as the one Irban uses. It is a bit bigger and has more capacity than my file box cart. The wheels are from Northern Tools and have to be ordered in. I haven't used this one much, mostly because I need to make a handle for it still. You can sit on top of the cooler so you don't need to carry a stool.