Hi RB, With multi-band dipoles you will have to use an antenna tuner.
The lengths you see in the charts are chosen such that the
antenna+feedline will have an impedance (hopefully) on multiple bands
that your antenna tuner can handle. Usually if a 135' dipole won't
load on a certain band, the feedline length is changed, because it is
easier than bringing down the dipole and changing to 140'.
Gary N4AST