I use a mix of Mothers and Meguiars polishes. I wax my white 12 passenger G2500 every couple months and it looks fantastic. It's a 2009 with 64K miles, and I want to stave off the rust as long as I can. I wash and wax my G6 every 4 months as I don't drive it much (7-8K miles a year).
I gave the van a wash and wax at the airport before heading down to NY for the weekend back in May. It was getting dark when I finished so the photo isn't too clear. I used Mothers wax this time. There are no noticeable streak marks afterward. I hand polish it - takes a couple hours per coat. A full detail can take the near part of the day if I decide to clean the seats. I also wax the windows (not the windshield) and headlights for maximum effect to keep the rain off.
'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019
'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)