Few of the WORK SITES that I drive daily ; WTC/Staten Island/Jersey City, NJ- H1B-Epi-438 H1B. I have learned several things on Storage-SAN-IBM/NEC/DELL EMC etc end to end on Rack and Stack to configurations to Client documentations etc, Networks, Servers etc and also on the H-1Bs travel pays, Over Time, Time and a half and tolls, gas, miles etc. I have explained this in videos very clearly.
American peers advised at that time to refuse them(PV) as if you meet any car crash, they will ask you to pay this cost at your cost. If you are on H-1B, do not do this. Refuse or quit project. Everybody ue non immigrants as tissue paper in the America.