What options have worked for you all , I am not much of a pod user , when you don't have it you will need it thanks to all in advance. Going on cross country car trip
You mention RRS and Gitzo so I assume that budget isn't an issue for you. It's worth reading Thom Hogan's
well-known essay on buying a support system. Out of date with the models but still relevant. Also think about what your heaviest/longest piece of equipment is likely to be, not just now but in the foreseeable future. The idea is to spend your money once and spend it wisely.
Really Right Stuff (RRS) and Gitzo in that order are at the top of the heap when it comes to tripods. The RRS models feature metal components that are milled from solid pieces of aircraft grade 6061-T6 aluminum, an expensive process but the parts are bulletproof. Their carbon fiber is of a composition that provides a strength to weight ratio they claim to be superior to the competition, and the finish on their products is very good. They are a small boutique company that makes outstanding products with no expense spared, but you do pay for that quality. Their after-sales service has a stellar reputation.
Gitzo used to be the leading quality brand but they have been overtaken by RRS. In January of last year they released a new series of systematics that had specifications that in many cases were poorer (folded-length longer, heavier) than the previous versions and the prices went up into the RRS range. They really shot themselves in the foot last year. They have a bewildering array of products and components and don't do a good job of explaining the differentiation. They use cast magnesium alloy for their metal components, lighter than aluminum but not as strong. There have been reports of Gitzo tripod bases fracturing in extreme cold; because of the manufacturing process cast parts are susceptible to this and Gitzo cautions users with a temperature range for reliable operation. They are good tripods, very good, but they are no longer the best. And if you live in the United States their service is appalling.
For Leica M only a travel tripod or at the most a 2-series is all you need from either RRS or Gitzo. You should check out their respective catalogs/online offerings to find something that's suitable for your height. Don't forget to add on inches for ballhead and camera height.
WRT ballheads Acratech, Arca-Swiss, Markins and RRS all make excellent products and it's really down to personal preference. If you shoot in extreme environments such as severe cold/sand & sea or dust get an Acratech. Their open designs mean very low maintenance and simple cleaning, for example you can sluice sand and dust out of their heads by washing them under a running faucet.
Arca-Swiss, Markins and RRS offer sophisticated friction control and very smooth operation. Markins heads are copies of the Arca-Swiss B1/Z1. RRS heads offer unique designs with a low center of gravity. You would not go wrong with any of these heads but whichever you get make sure to get one with an Arca-Swiss type of quick release system which is now almost universally used.
If you end up buying a travel tripod with fold-back legs know that you must buy a ballhead with an outside diameter (includes ball housing
and panning base) <=50mm for the legs to fold back parallel to the center column. The Markins Q3T meets this requirement and is the best travel ballhead you can get. Its only drawback is that the panning "lock" knob doesn't actually lock the panning action; it's actually designed as a brake. If this is a problem for you (and it is for some people) don't buy a Markins.