According to Figure 6.1 in the AAMVA CDL Manual, which combination vehicle type has the highest rearward amplification (the most severe crack-the-whip effect)?

49 CFR 383.115(c); AAMVA CDL Manual Section 6.1.2 and Figure 6.1, p. 6-1–6-2

Figure 6.1 ranks eight real combination types from least to most crack-the-whip effect, and triples sit at the extreme end. Knowing where your rig falls on that scale tells you how much more gently you need to steer compared to a basic tractor-semitrailer.