I started with the same carry all as a base on my 28 hp Yanmar F24. I patterned mine after this one.
http://www.tractorbynet.com/forums/attachments/107937-multipurpose-lifter.html#post1227820
I made mine about 4 feet wide, just a little narrower than my tractor. If I had to do it again I would make it wider.
Even with 140 pounds on the front bumper I can easily lift the front wheels off the ground with a half load of rocks or a full load of wet compost. Sometimes I back up the hill when I have a full load.
A few changes I made:
- I don't have wheels on mine. I drop mine on a pallet which makes it sort of easy to move an inch or 2.
- the channels on the back are tall enough for 2 2x10s so the back goes about 2/3s of the way up
- I added another vertical channel just behind the seat and put a 2x10 there. That forms a box in the box so I can put stuff on the seat without worring about it falling off. That also leaves room for loose stuff under the seat.
- I have 2 stakes so I can put a number of medium sized logs across it
- I used to use about 200 small square bales a year for my horses, not enough to buy a hay wagon and the bed of my pickup is way too high to easily load. I made an 8 ft wide base and front to carry hay. My wife would creep along in 1st gear with the carryall just off the ground and I would stack the bales 5 wide and 3 high. Any more than that and the front would get too light to steer.
Mine is about 4 years old and is dirty and goughed from constant use. Since I don't have a FEL it is an indespensible tool.