I asked the boss years ago why they don't have APU's.
Van Wyk, Inc. has a fuel bonus program unlike the laughable ones the big fleets have. Most drivers achieve it.
4 CPM off the "hub" (qualcomm) if you keep your speed below 66 mph for 90 or 95% of total moving time, idling below 10% in winter, 30% in summer.
A couple years ago they tweaked it to allow 35% in the hottest months, and a little more in the coldest months.
Because the fuel bonus is actually achievable, drivers actually gave a crap & would follow those guidelines.
So the fleet average idling time is very low, so low that the expense of an APU won't be recouped in the 500,000 miles they run each truck before they trade them in.
Driver comfort obviously isn't a concern to them.
But with the new emissions systems being so unreliable & with extensive evidence showing that idling greatly increases the emissions system problems, and with long periods of downtime combined with failed diagnoses & the problems not getting fixed right the first time, it might be time for them to consider APU's.
They need a setup that keeps the coolant, fuel & DEF warm in addition to maintaining the batteries and providing AC in the summer.
Keeping the coolant as warm as possible will reduce the amount of time the engine takes to reach full operating temperature, resulting in less crap being blown into the global warming filter.