Twinwall plastic is the complete answer for this sort of application. I installed 4 culverts for crossing points across deep ditches on my marsh last spring. As long as you have at least one diameter of pipe thickness of fill above it (i.e. 3 feet of fill for a 36" pipe) they will stand terrific loads. In one smaller ditch I put an 18" pipe & only about 6" fill over it & there is zero deformation while driving over it with 2 tons of tractor plus about 1 ton .
In UK they come in 20 ft lengths with separate couplers.
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Today's Featured Article - Buying your first tractor: The People You Buy From - by Chris Pratt. If you are a first-time buyer, chances are that you are likely to take the word of the seller on things. This is where the problems start... You have reviewed your implement needs and determined the size of machine that will fit the bill and even made a list of the most desirable models. You checked on the availability of a 3-point hitch for the machines on the list and advertised in your local classified paper with so
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