It is especially the runway info causing me trouble.
RVR is mentioned on the ATIS when visibility is way down due to precipitation or fog, normally when visibility drops below one mile. Is that one of the runway components you are questioning?
At many airports in the US runway visual range, or RVR, is measured in feet and is a criterion used to determine whether an instrument approach can be started (part 121 - scheduled air carrier, and part 135 - air taxi, freight) or a landing can be made.
Instrument charts in the minimums table at the bottom of the chart give visibility in the RVR value, as seen here:
The 18 and the 24 I highlighted are actually 1800 (feet) and 2400 (feet) and that is the minimum visibility, or RVR value, a pilot must observe in determining whether the approach can be started (again, all operations but part 91) or, once on the approach, a landing can be made.
Therefore, on a low visibility day you might hear on the ATIS among other things, ".... RVR 1800, touchdown 2500, rollout 2500." This translates to runway visual range of 1,800 feet, runway visual range at the touchdown point of the runway as 2,500 feet, and runway visual range once rolling out on the runway of 2,500 feet.