Been through this twice......
Check with your insurance agent to make sure the equipment that is bolted to the van is covered. With my insurance, we had to modify our insurance plan to cover that.
Second, plan on about a month or longer before replacement of the van and equipment. The insurance has to go through the paperwork, and other stuff to evaluate proper compensation.
Third, make a detailed list of EVERYTHING in the van. Take pictures. While the insurance companies are battling it out on who compensates who, start locating replacement equipment. You'll probably be looking for used, since they may only use the value of the equipment and van in its current condition (mileage, hours, etc). Make a list of all chemicals and assign a value to each. Unfortunately, you probably won't be compensated for lost time/wages. But, in the meantime, you'll have a lot of homework to do...
Lastly, do NOT get emotional with the adjuster. Be nice and have your ducks in a row. If you have your homework done, and a value for each and every item, and a value for installation IN WRITING, your process will go with less headaches. Be patient!
So sorry about this. Stressful, I know! Hang in there!