I'm impressed with the custom winter fronts you make!
I have a 2014 B2650. I bought it in the spring of 2019. 
It was still brand new. Poor fella bought it, put 12 hours on it planting some trees then, unfortunately, he passed away. His widow had it in their heated garage for 5 years before deciding to sell it. I'm about to hit the 200-hour mark now. I put some time into it during the summer. I have 3 acres, my dad has 2 acres and I have done custom tilling for gardens.
I've been pushing snow with it this winter and I find it struggles to keep the temp above the bottom mark on the gauge. Just as you mentioned.
Are you still making these? Could you PM me a price or email me at 
brad@johnsontruckline.com 
						
					 
I "started a conversation" with you as this message can only be short.
If you log into the OTT website and see this message....If you look in the upper right corner of the page, you'll see an icon of an "envelope".
Select that envelope and you should find my message with more info in it.
Another alternative: feel free to use my regular email address dbratager@midco.net
The "start a conversation" and regular email work a lot better. I'll wait to hear from you after you find that message above.
If you have trouble finding it....message me here again and we'll get it figured out. Anyway, I'd be happy to try to work up a set of covers for you.
David