To the OP, Ihope you make it safely. Do everything the Moderators listed. What has worked out well for me is incorrect. Sorry I caused a lot of confusion answering your mechanical question with what I have done in the past driving on snow covered terrain.
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I have and always will be of the “balanced” approach to setting the tandems. I typically will reset after my first and sometimes second stop to maintain optimal weight balance.
In the case of the OP, I believe he stated his tandems were set all the way forward (1-hole perhaps?); meaning he can’t move any additional weight to his tandems unless the load is reworked. Moving them towards the rear of the trailer will further reduce the tandem weight creating an even greater imbalance.
If all of the information provided is accurate, I’d leave them as is and elevate overall care and prudence while operating in winter conditions. Increase following distance and drop the speed at a minimum and as Pack suggested no cruise and no Jake.
Be extra safe everyone...‘tis the season.
Tandems:
Tandem Axles
A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".
Tandem:
Tandem Axles
A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".
OWI:
Operating While Intoxicated