In practice it's of course not so simple. Every truck that passes you (or that you pass) will suck you right in if your tow vehicle isn't heavy enough or you don't have good enough grip. Also, (RV/drum) trailer brakes suck so hard that you really want a vehicle with some additional stopping power other than regular brakes (heavy duty transmission, big engine, and diesel exhaust or compression brake). E-brakes work well so there the e-assist trailer has a real advantage if it can do that but you'll have to get used to the feeling of being pulled back rather than leading the stop... So evy 6.7l diesel I tow a big RV and e-assistance would be very welcome but costs likely drastically reduce the attractiveness of such a system for an RV. For a trailer that's constantly on the road I can definitely see a use case but it's not to be towed by a (comparatively) tiny car