I think you're probably still looking at a standard loader for a Lo-boy. They really don't lift much higher than the sides of a pickup, when you account for the down angle on the bucket needed to dump the material from it. I think the lo-boy loader only lifts about 8-feet high, but you take about 2-feet of that away when you dump the bucket. Sides on a standard pickup are probably 5-feet high, so you only have about a foot of clearance. Also remember the geometry of a loader... the higher you lift, the further back over the hood the load is, so you need some arm reach just to be able to dump materials out in front of the tractor without hitting the hood. Just some thoughts..
1951 Farmall Cub, Cub Cadets 102, 104, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller