So my truck will crank and crank and crank but will not turn over. please help?

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So this problem arose after i made a 800 mile trip from arkansas to north carolina. The truck made the trip just fine but once i got here, it wouldnt start after spending the night. At first i thought the problem could be the battery so bam, new battery. Problem persists. I then checked my spark plugs and went ahead and purchased a rotor and new distributor cap which i installed today. YES the plugs are in line and no lines are crossed. I went ahead and double triple checked. Still the problem persists. I can smell fuel when i crank the key so i know the fuel pump is good. Also i replaced my alternator less than 2 years ago so that should be good as well. Starter is less than a year old, battery is 4 days old, distributor cap is not even 12 hours old. If you have any ideas or comments or suggestions I would be very pleased to hear them. This is my only source of transportation and gravely need to be mobile. Thank you. --Jax