A ditch by a hill is the cheapest "ramp"

Drop the rear wheels in a ditch, and or back up to a bank / hill, no ramp needed.

If you don't have the perfect hill, then some planks from the bed, over the tailgate, to the hill may work.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-