Sled deck
Sorry I missed this post previously. I decided to build one when a buddy had one sitting in his back yard with a broken axle. It is an older trailer so it is only 92" wide by 8' long. 92" wide means you need at least one narrow stance mountain sled on it to carry 2 sleds. New trailers are usually 101"
My ramp is 10'. I didn't want it to be too straight up and down when using (and most actual sled deck anufacturers use a 10' ramp - I'm not saying a 8' ramp wouldn't work, but the longer the more comfortable you feel/less speed needed to get up/less chance of going over the front).
If you can find an old trailer it works well, but it does tend to be a little heavier than building one from scratch (because trailers are made to handle a lot more bouncing and stresses from road travel). Here is what I have in to mine for costs:
Old Trailer: $100
Aluminum stock: $600
Welding work: $500 (obviously if you can weld yourself you can save a ton of money).
Old truck bed liner for ski guides: $25 on craigslist
New lights and wiring: $125
Plywood and fasteners: $75
TOTAL invested: $1,425 (This was about $400 more than I had hoped)
The ramp was by far the most expensive and time consuming part. Having the tiedowns from the truck camper already on the truck helped. You cannot tie to the brackets inside the bed. They are not rated for any serious weight...
A couple things to consider:
If you build from scratch, build it from steel. You will save money on both the metal and probably the welding. Plus it will end up weighing close to the same since you need some pretty heavy duty aluminum to support everything.
As far as load limits go, on a 1/2 ton, you will be over capacity. My truck is a 3500 so 2 sleds, 4 guys, 3 place trailer and all of our gear only moved the suspension about an inch. In the summer though I put a truck camper on the pickup. When loaded the truck camper weighs around 4,000 lbs (3,300 lbs dry). When that is on you do get quite a bit of high weight sway, but once you are used to it it is no problem. I am equating that feeling to a sled deck on a 1500 because you are at the same weight limits. On a 1500 I would recommend airbags to help balance the load and keep yourself from ever bottoming out (I use airbags when the camper is on the truck).
Truck camper: