(If you change “vehical” do you have to re-calibrate the unit?)
Yes. But its a function of the VGL system. A gravity baseline is taken and rechecked every thime the unit is used. A new vehicle would alter the gravity signature.
(What kind of coils are used to contain, and maintain the singularity?)
I am not a phycist so I can not answer that to your level of sophistication. The singularities are held in an enclosed magnetic field.
(Can your unit also dimensionally travel?)
No. However, the longer the unit is on past a safe divergance confidence, the “stranger” the world line becomes. The unit I have is safe to about 1% for every sixty years at max power.