My truck of choice is the Atlas Roller Bearing truck, either 70-ton with 33" wheels or the 100-ton with 36" wheels. All of my Lionel gons ride on Atlas trucks. Super easy. great ride height. I sell off the lionel trucks or MTH trucks I get on rolling stock. Atlas has the best truck out there IMO for the money. If I need a lower ride height on a conversion I either grind down the truck bolster or use a replacement bolster from shapeways (Jim Lincoln) as mentioned in previous posts. I don't buy brass trucks anymore. Not necessary. if I could afford it and there were plenty available, sure, the Protocraft trucks can't be beat!