When i was into designing HO model kits, back when Tichy Train Group was Gould, my ideas for making a good running flatcar was to make the piece that flat of the flat car out of solid metal.
At that time i was thinking of etching. (chemical) Today i might use laser cutting.
Then the car would be at least minimally heavy enough.
Who makes good trucks for On30?
I flag trash. You have been upvoted by trash. I have negated the vote from said trash.
It's yet another new low brought to you by @berniesanders (hiding as usual behind an alt account to make it seem like he has friends). Here is an updated list of accounts he uses to harass/flag/spam with. See for yourself.
I flag trash. You are trash.
Take it somewhere else please.
The 2 best companies that I can think of for On30 trucks, depending on what style of truck you want, are Bachmann and San Juan Car Co.
This company makes some really good stuff.
http://www.sanjuancarco.com/