Help with auxiliary fuel tank decision or replacement.

I have a 60 gallon auxiliary tank in my truck. Bought it when my truck was brand new. Best upgrade I have done so far.

My truck is used almost exclusively to tow, so it also sits during the winter. I haven’t had problems with fuel sitting yet.

If I had a short bed I would probably want the replacement tank to save bed space. But that is a lot of cost for not a lot of extra capacity.