I always have two NATO Jerry cans on the bumper of my TC. The 20L can is for Diesel, and the 5L can is for generator gasoline. I use both cans frequently.
I also have a shallow truck-bed tool box that was given to me several years ago. I turned it into a front-hitch storage box that I’ve used to haul gear that I don’t want inside the truck or camper on three trucks now. No sign of running hotter on any of them. I carried a 2.5 gallon Blitz can in it till I got the 5L Jerry can. It’s been through several revisions and upgrades, and I think I’m on revision seven or eight now. You can see a few of the changes in the pic’s below.
:):)