Tesla Inc (TSLA)

[pack10]

As a former fleet manager for over 25 years I can say without any doubt that it does not cost anywhere near 37k a year to maintain a class 8 highway tractor. The highest cost come in the later years when an overhaul or replacement motor is needed. Some trade at that point others overhaul or replace.
this first 5 years are pretty maintenance free. That is less than 5 - 7 k.

Check this article out from a supplier to electric trucks.

While truck manufacturers and their suppliers are moving toward electrification at a swift pace, further improvements are needed to make the business case work in most trucking applications, said Joshua Goldman, vice president of business development at TransPower, an electric drive systems supplier.

Currently, trucks equipped with an electric powertrain can cost about $300,000 while delivering a 150-mile range, parameters that work for subsidized tests at ports, for example, but are not economically viable for most fleets.