They aren't really that much more heavy than normal trucks. We're talking a couple of percent of the useful payload here. They aren't 'tremendously' heavy but just about the same weight give or take a couple of percent. A couple of tonnes of battery goes a long way. And it's not like big diesel engines, assorted plumbing and other systems, and a couple of hundred of gallons of fuel weigh nothing.

There's no need for new pavements, or any other solutions for a perceived problem that simply does not exist.