We stacked brush butts to 1 side on base for stiff lever, to roll flip across the short axis of heavy equipment trailer to flip off with another vehicle pulling to side.
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Get base about 5 branches deep of flat 'fans', trim wheel well shapes out. Then build up from there and in this range can center cut down length of trailer, build,cut etc. Leaving base untouched lever fans, middle some give and cuts let sit down more. then saving some nice fans for top a few layers deep. Cross webbing straps in X on top so must tighten if starts to slide, not where strap in straight line down trailer and rolls off side with load... Tighten ratchet, hold purchase, pull slack thru ratchet and tighten again. Greater leverage of tightening when empty, not full. i even sweated/swigged 'em some.
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At dump site, rope over top sideways bowline around base ends, to have other truck pull sideways of/flip off trailer. Sometimes right onto smoldering fire, lost a few tires to heat doing that when it flamed up.
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Also tried preset, long rope to bottom of trailer, each end tied off to very end of a trailer side, slack of bight in trailer nose. Fill branches across again, about the same formulae, solid base and top, some cuts in sandwich in between to lay that section nicer. Fold slack bight/tongue over load, 1 strap tighten at end of trailer. At dumpsite , tie off to payloader, tree and pull forward hard. Or again have other truck pull off.
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Flipping off short side was better full loaded/especially on longer trailer stacked with middle range cut and compressed, than long draw down center. But if alone, side pull need to unhook and stabilize trailer, and pull off sideways by self with own truck not as slick. but at couple of job sites even had stump with triangle out of side for setting trailer nose in to stabilize against side pull. Use chains to grip around stump, sometimes had to tie off rear so couldn't swing around. As was taught, to steady azz git'er done!
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Sides, reduce access on and off trailer. Low boy trailers with bed almost on axle and small diameter tires requires less lifting force and duration, same man can also stack/reach higher.