Satellite meter

I have Direct tv at home and are going to take with us in RV. First of all have to have a dish to get Direct TV HD. Do I need a meter to help find the satellites. Also can I use our receiver box from home and not have to pay another fee, beings will not be using it at 2 locations at the same time. Had a problem at home and had to have dish realigned and he use a meter. He said it was better but not necessary. How do do find the satellites on your set up?

Thanks