Interesting....
Perhaps for your needs this does make some sence....
Just mount the tank and boom on a frame you can remove easily and you can use it in the winter for a toy, and expence it to your business...
If the fields are small, maybe a 300 gal. would be enough tank for your use. Since I don't have any idea of what chem/fert your spraying. Be sure to calculate the total weight so you know. Then ask the Tucker guys if it's within the rated load capacity of your machine.
Just so you know, these older Tuckers are I have heard are steel frame with aluminum skins. They are prone to the galvanic reaction/corrosion these two metals combined with moister are prone to do. If you spray any fertilizer, wash the dickens out of it every time you get the chance. You know what that stuff can to to metal...
Nice mountain tracks, not sure what they might do to your ground with the steel grousers. Don't they make an all rubber track? Maybe on the newer machines.
For our farming we love the two track system. In standing rwo crops the damage difference compared to wheels is not an issue.
I wish you and all here a MERRY CHRISTMAS!!
Regards, Kirk