I have a 07 2500 Denali XL that was converted with an LMM. My issue is the fuel tank that was put in it is way too small. Has anyone with a conversation put in an aux tank or swapped with an aftermarket titan tank and if so what size did you use? I'm fixing to replace the sump in this tank because whoever installed it just used a brass 90 and some how fixed it in the bottom of the tank. Occasionally when I'm pulling up a steep hill I can see my fuel pressure drop (Edge Insight) for a second and catch up when I get off the throttle. The sending unit is having issues as well so my fuel gauge is slightly off. Add a small fuel capacity to the mix and its becoming a PITA on long hauls with the travel trailer. Any suggestions?