Weight distribution question

How much weight are we trying to shove on the bed to make the backend heavier? Right now I'm rocking my spare tire mounted in the bed and a 20 gallon fuel cell on a custom fabricated bed mount that taps into the filler neck. Eventually I want to get a second spare mounted in the bed, if I ever take a trip longer than 2 or 3 days I may have to invest in a bed rack.

I'm not sure if that would be too much rear weight, or if that is even possible for a true prerunner?

 

Stock already has a 21 gallon fuel tank and spare in the rear so I’d say you haven’t gained nothing in the back yet.

edit: I misread. So you still have the stock tank also?

 

Over stock, I went from the 31 inch tire to a 34 and the weight of the tire carrier. I also am using both the stock fuel tank and the fuel cell. So all together maybe 240 pounds increase? I'm just not sure if there is a consensus 60/40 or 50/50 weight distribution we aim to hit for our trucks.

 

Full size prerunners hold 80 or so gallons of fuel behind the rear axle and two 39-40" spares.