As always, your mileage may vary, but I'll let you know how we have collected sap for several years & maybe it will give you some ideas to work with.
We have a 125-gallon poly tank in the back of a Kawasaki Mule. At first we dumped sap directly in the top, but that wasn't all that easy, the top of the tank is just high enough it's a little difficult to reach, especially when dumping bags.
We cut off a plastic barrel about 12" high, and put a regular 120v plastic sump pump (I know, it's not food grade but we haven't had any issues) in the basin. An inverter on Mule connected to a deep-cycle marine battery powers the pump. We also have a standard sump pump switch with a (new) toilet float to control on/off when the basin empties. And it's piped into the tank from the pump. So we dump sap into the basin, it's pumped into the tank, and the pump shuts off when the basin is empty. Very simple, fairly automatic, and it saves a lot of lifting. (See photo below)
We filter at the sugarhouse with a standard sap filter (https://www.leaderevaporator.com/p-2...ilter-bag.aspx) bag since there's no room for it in the tank.
photo 2.jpg