Unless the boxes are hooked to wifi or the internet they wouldn’t know if you had 1 or 5 boxes. Just add them to your home account and take them and leave at the camp. If you ever have equipment failure at your house and need a service call then the extra boxes would need to be onsite.

If you tell directv they will want you to have a separate service. Not very hard at all to set up. They older dishes were easier than the new style slimline. The new boxes have built in signal meters in the settings, just have someone watch the numbers while you make adjustments to it.