The Adventures of Sylvester, the 2018 Suburban 3500 HD

[Fless]

Etrailer has a mounting box with a worm gear clamp, for one:

https://www.etrailer.com/accessories-and-parts/Draw~Tite/18159.html

It mounts somewhat sideways so doesn't hang down.

 

[Geotrash]

Etrailer has a mounting box with a worm gear clamp, for one:

https://www.etrailer.com/accessories-and-parts/Draw~Tite/18159.html

It mounts somewhat sideways so doesn't hang down.

View attachment 452695

That's perfect! Thanks, Steve!

 

[Geotrash]

I wonder if there's a way to monitor both fuel tank levels via PIDs with a scanner. Maybe graph them over time to see if there are glitches or other weirdness (technically speaking...)

So, I finally had a moment to consult Alldata, and here are a few clues. I don't yet have a scanner that can read these (haven't tried them all yet though), so I don't know if I can monitor the PIDs. But I suspect based on the information here, that the higher fuel consumption while towing caused too great of a discrepancy between the front and rear tank fuel level senders, such that the computer switched the fuel gauge off rather than risk displaying what it calculated would be inaccurate readings. I didn't check for stored codes so this is only a guess at this point. But per below, setting the fuel gauge to zero and illuminating the low fuel light is the expected behavior when a fault is detected, so the only thing that doesn't fit is that my low fuel light never illuminated.