I have a used KM Pro Patch 55 Mastic Melter, used for 2 seasons before we upgraded to a 250 gal. Good unit, works well, ready to work. Will melt mastic or crack sealant. Photo attached is off KM website; my unit is in storage but I can get photos if you are interested.
https://www.kminternational.com/equipment/pro-patch-55-mastic-melter/
The Pro Patch 55 is equipped with engine-driver agitation and is thermostatically controlled with automatic temperature monitoring.
Dimensions (L x W x H): 87" x 34" x 34"
Weight - 585 Lb. (Unloaded): 1435 Lbs. (Loaded)
Capacity - 55 Gallons
Thermostat - 100-500˚F
Heating Element - 60,000 BTU Propane Burner