Uncontrolled high glucose [blood sugar] can lead to severe complications. You husband is currently exhibiting danger signs, others to follow if ignored and left untreated are:
* Blindness
* Heart and blood vessel disease (known medically as cardiovascular disease)
* Heart attacks
* Stroke
* Kidney failure
* Amputations
* Nerve damage
"We are truck drivers and out here it is difficult to eat properly."
I agree, truck stops don't provide the best foods, the menus are limited but there are better choices than what he's eating currently. Google diabetes nutrition and good carbs versus bad carbs for suggestions and start making better choices.
" Not able to get to a doctor being on the road"
This sounds like an excuse rather than a reason. By Federal law you must have rest periods. Even as a tandem long haul team both of you must take mandatory rest breaks giving you ample time to seek medical help. Get on your cell and make an doctors appointment and get the medication he needs to "help" control his glucose levels. The key word is help. If he doesn't change his eating habits, maintain proper weight, do moderate exercise, the medication [oral pills and/or injectable insulin] only can do so much before serious complications set in.
Yes, those are dangerously high blood glucose levels. The danger is of something called DKA which presents initially like a flu and requires a visit immediately to an ER as it can be life threatening.
You say you can't get to a doctor being on the road? Which is more important, your husband's life or his job? He needs to see a doctor right away and then work with his doctor to get those numbers down. You don't say much about what he has been doing to control his diabetes except to say he can't eat properly. What about meds? Insulin? You cannot afford to ignore those blood glucose levels.