I cant get a ton of pressure on my tractor forks, somewhere around 700 lbs. A quick switch bucket is on my bucket list though, clamp on forks are the only quick fix option for a pin bucket.
My father built the forks for my 275 but I ended up welding angle iron onto them, drilling 1/2 inch holes in the bottom and sides of each side of my bucket, and bolting them in place. It worked really well and I didn't even bother to take them off for light plowing. When I bought this tractor I didn't want to drill holes, so ended up with a set of el cheapo Titans. In hindsight I wish that I'd bought a bolt on tooth bar and built a set of forks using those same holes. The Titans are ok for what they are made for, but they aren't made for how I was using them.
My father also made a set of rear forks for the 8N which we used when I was growing up; we used them to carry pallets laden with boxes ready for planting seedlings. Once he got a tractor with a bucket he quickly realized that it was easier to get a scoopful if potting soil, and fill the boxes as needed.