groundhog i have that 40" ro from pure freedom and its excellant, it arrived on a pallet next day fully assembled ready to go.
I also do a few big jobs where extra water sometimes is needed but i just take the resin bottle and just top up the tank with that, yes it uses up the resin quickly but considering how much the large jobs are worth its a drop in the ocean, the 40" ro is really heavy, and with how much it costs I wouldnt risk taking it in the back of the van to jobs wouldnt want it being damaged sliding around in the back of the van