  Ionized outflows are ubiquitous in non radio-loud obscured quasars (QSO2s) at
different redshifts. We search for large-scale ionized outflows associated with
six optically selected QSO2 (five non-radio-loud and one radio-loud) at $z\sim$
0.2-0.5, targeting objects with extended radio structures. We have obtained
OSIRIS/GTC optical long slit spectroscopy data for these six QSO2 with the slit
located along the radio axis. We traced the gas kinematics with the
[OIII]$\lambda$4959,5007 lines to investigate ionized outflows and characterize
the dynamical state of the host galaxies. This second study has been
complemented with previously published FORS2/VLT spectroscopic data of 13 more
QSO2 at similar z. We identify ionized outflows in four out of the six QSO2
observed with the GTC. The outflows are spatially unresolved in two QSO2 and
compact in a third (radial size of R=0.8$\pm$0.3 kpc). Of particular interest
is the radio-quiet QSO2 SDSS 0741+3020 at z=0.47, associated with a giant
$\sim$ 112 kpc nebula. An ionized outflow probably induced by the radio
structures has been detected along the axis defined by the central
$\sim$1\arcsec\ radio structure, extending up to at least $\sim$4 kpc from the
active galactic nucleus (AGN). Turbulent gas ($\sigma\sim$130 km s$^{-1}$) has
also been detected across the giant gas nebula up to $\sim$40 kpc from the AGN.
This turbulence may have been induced by outflows triggered by the interaction
between a so-far undetected large-scale radio source and the nebula. Regarding
the dynamical state of the host galaxies, we find that the majority of the QSO2
show v/$\sigma<$ 1, implying that they are dominated by random motions
(so-called dispersion-dominated systems). Most (17 of 19) fall in the area of
the E/S0 galaxies in the dynamical diagram v/$\sigma$ versus $\sigma$. None are
consistent with spiral or disk galaxies.
