do a search for your year or several years and "move battery to engine bay". There are a few forums out there I like to change my google search to images tab and you can spot some easy that way.
he is a example with pictures
https://67-72chevytrucks.com/vboard/showthread.php?t=471303LMC also offers a drop down battery box allowing you to move it anywhere on the frame with it under truck. granted you have to get down to get to it but it hides it nicely and you don't have to go inside to get to it