Have a second laptop you use for travelling and treat it as unsecure. Any time a laptop is out of your control, especially when it's held by (any)government, you might as well assume it has had spyware installed on it. Plus you're at a much higher risk of theft while travelling abroad so you definitely should avoid having confidential business documents, etc. on it.
I use a netbook for travelling which gets a blanket format & reinstall before and after it goes travelling. Even then there's a risk that it might have had a hardware keylogger installed on it (this has happened to business people travelling to China in the past).
You use the netbook (or cheap laptop) because it's cheap to replace/lose if confiscated.
Your business or other legal data is encrypted in the cloud. If your business or other operation would not be harmed by customs having the data, have it also on the netbook for you convenience. Your encrypted data in the cloud isn't there to keep it sekrit from the government, it's there so you can get it at the other end.
If your netbook is not confiscated, or out of your sight for a suspicious period, then great.
If it's gone for a suspicious time, don't use it on the plane and get rid of it on the other end after wiping it.
If the netbook is confiscated or otherwise compromised, get a cheap netbook on the other end, download your clouded data, and biz on.
Repeat as necessary.
This doesn't protect your illegal (or impossible to prove legal) data, it just allows you to continue to operate after traveling through a bad neighborhood (the airport).
I use a netbook for travelling which gets a blanket format & reinstall before and after it goes travelling. Even then there's a risk that it might have had a hardware keylogger installed on it (this has happened to business people travelling to China in the past).