They did, decades ago. That is no longer an issue.

Now we have current efficiency standards that focus on cars. However trucks have much lower requirements because businesses might need additional capabilities. No individual would ever buy a truck as a personal vehicle , right? So you have these criteria meant to give a break to businesses, but ever larger vehicles mean that personal vehicles now also qualify. They can be made more cheaply, with more profit.

Somehow, they didn’t consider the criteria would be abused for more profitable personal vehicles

• Pickup truck? Clearly a contractor so let’s give you a break
• All wheel drive and high clearance? Clearly a rare specialty off-road vehicle that needs a break
• Seats 7+, even if they’re only toddlers? Clearly a transportation service, so needs a break in efficiency to carry more passengers
• Tow hitch? Clearly in need of extra torque and heavy duty frame for whatever business need you’re towing