Largest American-made passenger vehicle that still fits in a regular lane width. You could use a short schoolbus or something, like a SWAT team, but they're less comfortable :)
Also more conspicuous. Suburbans are common enough that nobody would think twice about seeing 3 on the road in close proximity. Three short schoolbuses would be weird.
Three black suburbans in a row are definitely very conspicuous.
Even bigger than my Yukon Denali XL by .5 inches despite having the identical frame.