As well you should. They're bigger than you. They intimidate me. That's quite a difference. Perhaps Congress should write new laws granting those same considerations to heavy trucks.
Industry tends to pressure truckers into driving long hours in order to meet deadlines.
I, personally, would advocate re-writing laws that would provide realistic delivery schedules. If a driver spends too much time behind the wheel, that driver will become dangerous. And drivers of passenger cars are just as susceptible to fatigue as drivers of trucks, PLUS they become just as impatient, angry, intolerant, and sometimes enraged with RVs as they do with big trucks. That fact, alone, makes for some pretty dangerous driving, as is evidenced by the increasing number of shootings taking place. Stay at least 2 seconds or more behind the vehicle ahead and, if driving an RV, make it at least 4 seconds.