[ludoo]

Hardware is cheap in the US, I'd leave my laptop at home and get something cheap (either a Chromebook or a used laptop), then access/transfer data and configuration over the net.

As for my phone, if I were in a position to be worried about customs installing backdoors, I'd prepare a recovery zip beforehand with all my data, then download it from my own server or a secure storage, and flash it after passing customs. Or better yet, travel with a SIM and buy a cheap Moto G, the resale value alone once back at home would make up its US price.