Wow, your vodka drive then beer and vodka sounds exactly like me, except I'm 150 pounds and never had a very high tolerance. The last time I drank a pint of vodka, I was stumbling and throwing up. I guess I'm sort of a lightweight. The other difference is that my ride home was only 20 minutes -- but I can see how an hour ride home and a taste for vodka can be a bad combo. I'd crank up the radio, crack open a half pint, and let the party start! I've called vodka "the most evil of all" for me because of how easily I can drink it (I just chug it straight) and how my wife doesn't seem to be able to detect it on my breath. I've heard the drink progression for heavy drinkers is from "brown to clear," mainly because of the smell factor and the chug factor. I've certainly met my share of hardcore alcoholics in the ER, and the majority be lovin' the vodka.
Since I started TSM about 7 weeks ago, I've only had about 5 shots of vodka. This has been the main effort I've put forth with TSM (Naltrexone does the rest of the work for me). Even without Naltrexone, I've always had a hard time getting drunk on just beer because it's so much effort and makes me feel so full (a feeling I hate as I'm an "athletic" build with no gut); plus, as a secret drinker, it's so much harder to hide beer both in terms of breath, the time it takes to consume it, and the waste (cans and bottles galore). But, if you got pulled over, if you're drinking four beers instead of eight vodkas, the officer is more likely to smell the beer than the vodka.
Wow, you're so close. If you could just eliminate the drinking on the way home, you could probably cut your intake by 70% and would rarely be drunk, especially as Naltrexone seems to work for you.
Tips off the top of my head:
(1) Call your wife and talk to her on the drive home for a few minutes every day. Let her know about your "temptation" to drink on the way home and tell her you want to talk 10-15 minutes about your day every day until your temptation goes away. You'll get major brownie points for this and your sex life will probably improve.
(2) Download some good podcasts either about drinking or about something else you're interested in (or an audio book, if you're that type) and listen on the way home.
(3) Buy a breathalyzer (I've had one for years) and, if you absolutely refuse to stop drinking and driving after work, at least check your BAC when you get home. Then, read all about DUI penalties in your state and watch shocking videos about drunk driving on youtube or elsewhere (this latter part helped me).
(4) Make a playlist or CD with some anti-addiction songs that you find inspiring (if you like country, there are lots of them). Pop that CD in and listen to it all the way home every day.
(5) Refuse to drink an entire pint of vodka on the way home! At the very least, switch to a half pint and one big drink. I bet you have enough inner strength to do that.
(6) If you're truly following TSM, keep your naltrexone pill on the front seat of your car. Take it as you start the car for the ride home and, when you get home, crack open a nice beer as usual. (Just committing to #6 alone would probably bring you very quickly towards your "cure"). Be sure to let your wife know your plan and give her a big (perhaps french) kiss upon arriving home before cracking open the beer. Anybody (unless they're just super-naive) could smell a pint of vodka in a kiss. Use the motivation you have to not be a disappointment to your wife and children to your advantage. Think about the poor souls in AA and how envious they would be with the idea that they could come home from work and drink all the beer they want and be proud of that!
(7) I know this is hard (believe me), but try not to lie about your drinking. I keep an accurate MS Excel spreadsheet with my daily drinks which she can access at any time. I also printed it out after month one and gave her a copy.
(8) Try to do alcohol free days during the work week. I don't know what your situation with alcohol free days is, but, in my opinion, nothing builds strength better than that. Plan, with your wife, a night when you promise not to drink on the way home, nor at dinner, nor after dinner. Make it a night when you both agree will end in sex -- sex, for most guys, trumps vodka every time. Start to enjoy sober sex (which I went almost ten years without experiencing!) and use that to motivate you. Tell her that, per the Sinclair Method, you are supposed to have more sex on alcohol free days so that your body learns to crave endorphin rushes from things other than alcohol -- see if she buys that line!

If you can't manage an AF day yet, see if you could manage a 2 beer day. I bet you could.
Anyway, I know I don't know you from Adam, but it seems as though the root of your binge drinking is fixable and that your future is bright. Booooo Vodka.