I bought a really nice Boars Hair brush similar to the picture from PAC back in the day.
It is great on every car except my Brilliant Black Crystal Pearlcoat '09 Grand Cherokee, which it will leave lines in the paint. So I tried using it more gently, and it wouldnt get all the dirt off, so I quit using it for that vehicle only, and went back to the softest chenille I could find, and all is well.
If you really want to get up there and its a big truck, or at least has big wheels/tires, there are only a couple of options - the Werner fixed height platform at Home Depot or Lowes, etc., or this nice adjustable platform at Amazon ----
[ame=http://www.amazon.com/Astro-Pneumatic-55600-Workbench-Scaffold/dp/B004KLSQ6A/ref=wl_it_dp_o_npd?ie=UTF8&coliid=I314O128M8VRGT&colid=2VT1YKJ8BB78D]Amazon.com: Astro Pneumatic 55600 2 in 1 Workbench Table / Scaffold: Home Improvement[/ame]
If you have Amazon Prime, that means it ships free and sometimes quicker than normal.
Good luck, I have had way too many black vehicles in my life and I dont know why I keep getting them! My kids even have black vehicles ! What have I created ????
One year in my business, I detailed 20 Black BMW's in a row - almost made me crazy, but I'm good at it and they all turned out perfect !
Good luck with your research on this !
Dan F