Took some pictures:
1. Brass connector/where it exits tank.
2. Fuel line running down the back with fuel filter + disconnects (white pieces right before it enters the tire carrier)
3. Fuel line exit from carrier + where it goes between bumper and body.
4. Fuel shutoff valve (zip tied to frame in the wheel well)
5. In-line fuel pump
6. Fuel line feed into gravity feed connector. Main fuel tank is on right, fuel filler hose coming from fuel filler on left.
Adding it up I probably have around $200 in it if you don't include the tank and the tire carrier. Looking at the titan tank you should be able to do the same thing. I ran the fuel in the aev carrier for protection/conceal it. If I were to do it again I would buy two sets of motorcycle disconnects and then just remove the section of hose between the tank and where it meets the body. The disconnects act as fuel shutoffs so would just be an easy way to do it without drilling your carrier.