Not everyone can afford a high power diesel with all the bells and whistles, especially the way they are priced these days. I say as long as it's safe and they aren't impeding traffic then ok. BUT, when they block traffic going that slow up a 2 lane 55 mph speed limit highway, not cool. That's when people start trying to pass and it becomes dangerous. There's not many trucks with haulers or rv's that can do the speed limit going up Potisi towards Pahrump, but at least there is a passing lane.