  We present ALMA band-7 data of the [CII] $\lambda157.74\,\mu{\rm m}$ emission
line and underlying far-infrared (FIR) continuum for twelve luminous quasars at
$z \simeq 4.8$, powered by fast-growing supermassive black holes (SMBHs). Our
total sample consists of eighteen quasars, twelve of which are presented here
for the first time. The new sources consists of six Herschel/SPIRE detected
systems, which we define as "FIR-bright" sources, and six Herschel/SPIRE
undetected systems, which we define as "FIR-faint" sources. We determine dust
masses for the quasars hosts of $M_{dust} \le 0.2-25.0\times 10^8 M_{\odot}$,
implying ISM gas masses comparable to the dynamical masses derived from the
[CII] kinematics. It is found that on average the MgII line is blueshifted by
$\sim 500\,{\rm km\,s}^{-1}$ with respect to the [CII] emission line, which is
also observed when complementing our observations with data from the
literature. We find that all of our "FIR-bright" subsample and most of the
"FIR-faint" objects lie above the main sequence of star forming galaxies at $z
\sim 5$. We detect companion sub-millimeter galaxies (SMGs) for two sources,
both FIR-faint, with a range of projected distances of $\sim20-60$ kpc and with
typical velocity shifts of $\left|\Delta v\right| \lesssim200\,{\rm
km\,s}^{-1}$ from the quasar hosts. Of our total sample of eighteen quasars,
5/18 are found to have dust obscured starforming companions.
