Frank, I remove and refit caravan wheels on an almost daily basis and don't use any fancy alignment tool.
Does such a thing exist?
And how do you align the alignment tool?
Anyway, this is the method I employ which seems to work without too much grunting and cussing:
First, have a wheel bolt inserted into a socket & extension bar ready at hand to screw into the wheel & drum.
Rotate the drum so that one of the bolt holes is aligned at 3 o'clock and apply the handbrake.
Rest the wheel on the hub cap and rotate until one of the bolt holes is at 3 o'clock.
You'll now be able to locate and screw the wheel bolt into the aligned hole.
Lift the wheel to align an opposite hole and insert your second bolt.
Fit the remaining bolts.
Don't forget to tighten the bolts in the correct sequence: 1-3-5-2-4.
John