Multichannel WAN

Hi,

is it possible to use multiple LTE / E1 / T1 / you-name-it WAN connections to form a portchannel style WAN connection?

Lets say i have a truck which is in the middle of nowhere but has a certain requirement for bandwidth. Can I mount up 3 x FortiExtender and a FortiWAN to use three times the bandwidth of a single 3g / 4g connection?

Or if the truck is lucky and finds a landline connection to bundle 3g / 4g and landline?

I'm not talking about loadbalancing or SD-WAN. I want to use all connections at the same time.

Similar to the stuff which peplink (https://www.peplink.com/) does..

Best regards

Philipp