Can I Go Ahead and Get an Alignment Done?

I have outfitted my truck already with an All Pro front bumper. OME 2.5" lift, and All Pro Sliders. I have an All Pro steel plate rear bumper waiting to get installed but a body shop needs to fix some paint on my rear end from where a guy hit me. I was also planning on leaving my skid plates off when I take it in for an alignment (All Pro IFS and crossover skid) To make it easier for them to fix the axle seal on my front differential and do a refill if need be on the diff.

The body shop can't get me in until next week. The Toyota dealership can get me in this week. Will the ~90lb rear bumper affect my alignment if its not on at the time? How about the skid plates?

Do I wait till the rear bumper is on or what should I do?

edit* I guess I could throw some weights in the back of the truck bed to account for a bumper but on the other hand, will the rear bumper affect alignment?