I was on big lake yesterday , entered on Gilford Beach and drove 4 miles out to a spot I fish in my Subaru Outback. Over 24" of ice not far from broads. Everything was frozen solid including all previous sled and vehicle tracks that were out there when it was a slush dump. I was going to drive off at Levitt but had a friend whose jeep had an issue and just needed to get it off the lake. I would say your good to go ,just expect it to be rough as hell as you enter the lake where all refreezing happened. Vehicle tracks going everywhere near center of lake.
I`m not telling you to drive out , I amm confident as I have been doing it for over 40 years and pretty familiar with the lakes characteristics.