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| Not sure if this truck is strictly field-to-your-binsite or if it'll be out there where DOT gives you a little lovin' once in awhile, but that Brigadier will NEVER legally scale given its axle position. on 20 feet you'll need a tri-ax.
Best layout depends on your needs. To consider:
1. Tri-ax with a lift axle in the last position(behind the twin screw): Make absolutely sure that the hoist will NOT operate unless the third axle is PLANTED and pressurized. This will save a TON of stress on the frame tails when hoisting. I've seen this done by putting in an air-shift PTO with a sequence valve that will NOT allow the PTO to engage until the rear-most axle is planted and system pressure is high enough to then shift the PTO into gear. Advantage is that when roading empty with axle up, your turn circle is smaller.
2. Tri-ax with a lift axle in front of the drivers [twin-screw]. This system allows you the same bridging, and has the advantage of the rear-end always supported whether you remember to "plant" the third axle or not. BUT its turn circle is wider and if you do not lift the axle during a turn you "scrub" the tread much more than you would compared to the lift-axle way in the back. Also, if you must traverse a huge bump, like high-slung RR tracks, you'll want to lift that middle axle up then replant it after crossing over. If you have a forgetful driver and this kind of hazards in normal driving routes, get the lift axle in the last position. | |
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Older grain truck project
