Load balancing and link aggregation are not really the same. However, it may provide greater throughput across multiple client devices, which may be less likely during travel.
How mwan3 load-balancing works
* mwan3 uses normal Linux policy routing to balance outgoing traffic over multiple WAN connections
* Linux outgoing network traffic load-balancing is performed on a per-IP connection basis – it is not channel-bonding, where a single connection (e.g. a single download) will use multiple WAN connections simultaneously
* As such load-balancing will help speed multiple separate downloads or traffic generated from a group of source PCs all accessing different sites but it will not speed up a single download from one PC (unless the download is spread across multiple IP streams such as by using a download manager