I just went through this on Thursday.
I have a dedicated model 322 receiver in our camper on a pay as we go program. They know this receiver is not in our home. I called Dish to request it activated. They asked for the model number and serial number on the smart card. They did not ask where I was nor did I tell them. Within a few minutes it's working just as if I was home.
I came home yesterday evening and the home system works as I left it.
Request your camper receiver to be placed on the pay as you go plan and they should handle it separately. That's how it works for me.