Yes but do talk to your alignment guy, some systems compensate for drivers weight (avg wt I would assume). Might not be critical but asking is free. I dont have the last word on this but I would want a "neutral" alignment with my weight in barbells setting on the pass side & instruct him to pull em over to the drivers side when he drives it on the rack before he exits the vehicle. My 65 dart just floated down the road when done (with max caster)

When you say "neutral" it sounds like you mean: with my weight in the driver's seat while it's on the rack, right?

Three bags of ready-mix (240#) or Portland cement (282#) should be close enough, and easy to handle compared to iron weights

I've got tubular A-arms so should have plenty of caster available. Manual steering, currently stock 24:1 but if PST ever makes a 20:1 box I'll buy one. Figure around +4 degrees is OK (I'm not too worried about increased steering effort).