I want to buy a semi truck from A private owner as a private finance with legal papers?

I WANT TO BUY A SEMI TRUCK BUT MY CREDIT SUCKS , ANY IDEAS OF SOMEWHERE or someone who have a good truck sitting and want to sell it but as a leasing ? I'VE BEEN DOING THE JOB FOR ALMOST 10 YRS AND THIS IS THE ONLY WAY TO FURTHER MY CAREER I do have a steady year around job otr rigth now on my bro truck nj to ca thats about 6k miles per trip 3 tps a month all i need is a good truck for those big hills etc. All i want is someone to sell me his truck and i make him the payments etc not finance via bank i dont have credit. Thanks