Mercedes heavy hauler 8x4

[TRUCKMAKER]

Hi Vernon, welcome to the forum. As far as frame rails I'd start with blank rails that way you can lay them out and drill what holes you need. If you use any of the rails from an existing Tamiya kit you will have holes where you don't want them due to the fact they don't make a twin steer kit. If you search Ebay for 1/14 truck or 1/14 Tamiya truck you should come across steer axle suspensions and steering system for a twin steer configuration.