Wow this thread got confusing lol slam a tank on there with plenty of hose and get to work usually 24 ft of hose and definitely a auto shut off nozzle. No need at all whatsoever for baffles in a 100 gallon transfer tank Over 119 gallons your into DOT territory hazmat https://www.dot.state.mn.us/cvo/factsheets/FuelTanks.pdf MN has exemptions for farmers
If you need more than about 100 gallons at a time might drop a tank on site and have the fuel truck fill it or make more than one trip with the pickup
You bet a 100 gallon tank needs baffles. Not only will it cause the tank to move, or tear the mounts over a matter of time from panic stops, but it will eventually destroy the tank. I wouldn't have a tank without baffles on my trucks. Wouldn't trust anyone who would build one without them. Not only does it stop fuel from sloshing around, it's extra support for the tank.