If you get lift springs it will be just as bad as the spacers. What matters is the height you are lifting the suspension, not the way you are lifting it.
Also, the Toe should not be an issue when they align it (even with the spacers or spring).
The camber can be fixed by puting in camber bushings (either fixed or adjustable).
The Caster can be fixed by using a Moog adjustable caster Radius Arm bushing. If you do any hard wheeling then I wouldn't use those Caster adjusting bushings. They are hard and can shatter (I shattered one when going over "whoops" too fast when I was at the Glamis sand dunes). I use Moog problem solver Radius Arm bushings (they are rubber with a metal sleeve in them). My caster is off, but the caster split is close enough that the truck doesn't pull much (slightly to the right but the tires wear evenly).
If the toe is set out too far it will drive squirly. If the Caster split is off it can pull to one side of the other. Also, if you lift the vehicle (on a jack) and then put it on the ground you need to drive it around to get the suspension to settle (just one lap around the parking lot will be more than enough). If you don't then the camber will be off.
Also, if you lift it enough to make your steering look like an inverted Y then you will get bumpsteer.
When I last had it aligned I put in a dropped pitman arm and now the truck goes straight over bumps with no movement of the steering wheel like it did before.
I don't know of a dropped pitman arm you could use for a 2" lift, or if you even need it since I don't know how much lift you really got. I know the explorer pitman arm has more drop than the ford van (e-150) and an f-250 so I know you can't use the arms from those vehicles.
Also, do check your steering box. Have someone move the steering wheel back/forth (through the free play) so you can watch the input shaft (shaft going into the steering box) and see how much it moves before the tires start to move. If there is a lot of movement then your box may be bad. You also need to make sure that the pitman arm moves the same time the wheels do. If you have bad tie rod ends the pitman arm with move and the tie rods will shift but the tires won't move right away.
~Mark