Bolt pattern for Reese goose box

[Jmckaycr]

I just purchased a new truck. Where my fifth wheel sits is not level. I’m switching from factory setup to a Reese goose box. Has anyone done this on a 2020(on up to ‘22) GMC Sierra 3500? Needing to know which holes you used to get the needed 7” clearance on the bed. Or a picture would be great. Thank you in advance.

[RVGator]

I’ve got the 20k Reese Goosebox on my Avalanche paired with my 2021 GMC Sierra 3500. I’ll attach a couple pics and if it’s not clear enough I can take some more. Height on the bed is good even though I have a retrax bed cover which has raised rails. Make sure you inflate the airbag in the Goosebox per the recommendation as well.

[Jmckaycr]

Originally Posted by RVGator

I’ve got the 20k Reese Goosebox on my Avalanche paired with my 2021 GMC Sierra 3500. I’ll attach a couple pics and if it’s not clear enough I can take some more. Height on the bed is good even though I have a retrax bed cover which has raised rails. Make sure you inflate the airbag in the Goosebox per the recommendation as well.

Which bolt pattern did you use? Standard or low on the box. One more pic of the goose box close up so I can see which bolt holes you used on the trailer would be great. Thank you very much.

[RVGator]

Here are a couple close ups. 1 from the inside and 1 from the outside. Looks like the standard

[Jmckaycr]

Thank you. I appreciate your time.