Wider is OK, but you can't pass between the Billboard and the hitbox of the trading platform vacuum if you go wider. (test it.)You will need to go 2 blocks wider. keeping to odd width for the trailer bearing. DON'T use off road suspension. Note my long straights, are one block wider then the wheels. Scrap Mechanic, will pop guide wheels under a singe block rail, even on straight sections. When scrap mechanic has large or fast items it will "Phase" through blocks. That's why the the 2 block rails are used with 2 tyres. Reminder 1 post and disconnected blocks (gap) per tile. The length of the 6 large wheels is important if you want to be lazy on the accuracy building corners. The length allows for a "softer" guide pressure in corners too. Smaller bogie = more effort in building corners were the gap between them has to be more accurate. It also means more pressure on the leading guide, making pop through more common and reducing your corner speed. Needing 3 blocks high and add 2 blocks width. If you want to climb (inclination) remember to add up/down bearings to the trailer. The you should be able to climb a 4:1, or a 3:1 slower. Only climb on a straight section, make sure to make it "3 blocks tall" and watch the trailer does not scrub on the tiers. Also climbing will slide the crates back. If you can for climbing, make the climbing section as long as possible for speed. Eg 16 Blocks for the first rise, 12, blocks, then 8, then 4. At the top the other away around.

@@GuardianOz Alright. When I get back to my computer I'm gonna have ton of fun building It. Thank you!