Here's some comments, in no particular order...
With Bear Warrior, the Gloves of Man from Savage Species will let you wield weapons and such. Quite pricey though, and it would be pretty crushing to lose them in mid-adventure.
The Natural Heavyweight feat from the Planar Handbook doubles your carrying capacity, allowing you to toss twice as much with overburdened heave.
Gauntlets of Endless Javelins (MIC) would give you a never-ending supply of X-sized javelins to toss at your foes when you don't have a huge lead ball handy. Quaal's Feather Token (Anchor) will give you an anchor for 50g, which can also be pretty heavy.
Primeval (Frostburn) might be another solid PrC for a hulking hurler, though the feat requirements between primeval and HH are pretty rough.
Polymorph, Shapechange, and wildshape (dire ape, legendary ape, elephant) can all help with size and strength, especially the Master of Many Forms' ability to turn into Huge giants by character level 11 or so. Wildshape Ranger 5/MoMF 7/HH 2/Warblade 1/Bloodstorm Blade 5, for example, would be a strong build, though you don't get the returning ability until level 19.
By the way, I don't think levels cragtop archer works well with hulking hurler, since its abilities work with projectile weapons such as bows and crossbows. 1 level for Farsight would still be solid though. Here's a build that can do what you'd like, though I'd love to fit in Natural Heavyweight and Precise Shot.
Build:
[spoiler]Dragonborn Half-Ogre Duskblade 5/Warblade 1/Bloodstorm Blade 5/Hulking Hurler 3/Bloodstorm Blade 3/Cragtop Archer 1 (LA +2)
Feats:
1st char: Point Blank Shot
3rd char: Weapon Focus: Javelin
6th char: Leadership
9th char: Flyby Attack
12th char: Power Attack
15th char: Far Shot
18th char: Mountain Warrior[/spoiler]