Is the Tabloid paper size one of the predefined paper sizes of your printing device?
If yes, my first step would be to crate custom paper size with the dimensions of Tabloid paper and non printing areas (margins) from your printing device. Than try to assign this paper size to your page Setups. Than test batch publish.
Or you can create borderless Tabloid custom paper size and fine tune the position of the Plot area on the Layout.

Maxim