Once a year we pick up our 1/2 of steer from family farm and then camp one or two weeks with rest of family, usually late summer, temps 80-100 and boondock middle of nowhere. At first we were careful and worried and concerned about freezer temps. Every time we stopped we would fire up Honda generator. Then stumbled across one of these, which takes the guessing of what the freezer are.
https://www.amazon.com/AcuRite-00986A2-Refrigerator-Wireless-Thermometer/dp/B004QJVU78 Turns out we didn't need to be concerned as we were. Our Home depot $180.00 chest freezer has 2 lights. One is if has power and the other is if freezer is working to get colder. We usually dig out frozen food of what we need in the morning and leave shut as much as possible. I think that's the key, don't open and close door all day long. Get out what you need and keep lid closed mush as possible. Which means keeping grandkids pop cycles in RV freezer, not in big freezer.
Getting the freezer in and out of bed of pick up is my biggest hassle.
Not sure about if money is worth it or not if we were hauling it around all the time.
:):)I just know my wife likes her "grass feed" beef. Not to mention if her "more healthy for you grass feed farm beef" was raised in a field basically 300 feet jet airplanes coming and going 24/7. I guess the steam I see when cooking it is used jet exhaust:)
The wireless temp gauge comes in handy being able drive down road and know what temp freezer is.
Also if you're out in the woods don't be surprised forest people or game wardens pay you extra attention. Seems to be topic of discussion.