I sometimes think that wheel aligners are over rated. You don't know (and sometimes they don't either) if it is correct or not. I have been doing my own, which on the Rodeo is quite easy as the camber spec is 0 degrees. A good quality spirit level will cover that. Don't think a computer is needed, the Isuzu camber tolerance on my vehicle is +/- 0.5 degrees, which is a whopping 12 mm from top to bottom of tyre. It is important to get the front trim height correct first. On the Rodeo there is an Isuzu procedure for this that uses 'a magnet, a spirit level and a length of kite string'. Works too.
For toe-in I use a laser level. Again the Isuzu spec is 0 +2 mm so not too difficult.
I have not tackled caster but this is the least likely to change with use. I'm still thinking about it...

Andrew.