Sometimes the devil is in the details!
So how this works out is going to depend on how it is set up. If it is correct and there is no drain on the battery, no reason at all not to hook early.
Done any checking on what it takes to tow the SUV in whatever way, (four wheels down, on dolly, etc.) so that the transmission is set up for however it is to be done? Lots of different options, some like electronic automatic transmission will take really specific methods.
I mention this as I would not want to say all is okay but new folks miss checking for their specific methods. I have a 2014 Ford Focus and it does take really special wiring and specific setting of the transmission.
Just because a neighbor does X,Y,Z to tow doesn't mean we can do the same, so care is needed.
If it is only a matter of hooking early and you've done the same tow before, most likely all is fine to connect early.
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