I just purchased a hitch from a guy I know who was parting out his K5. Anyway, I have the bolts and the hitch and I am ready to install it. My question is: Do I have to do anything before I install the hitch or can I simply bolt it right onto the frame? I assume I won't have to drill holes or move the gas tank right? Shouldn't the hitch just bolt right in? I am just making sure I am not overlooking anything before I start this project.