The big issue I suppose is convenience. Many people like the convenience of an adjustable towbar so they can connect the vehicle to the moho just by being close. The fixed towbars have to be precisely positioned to mate to the hitch.
This is a source of frustration for many, but the more convenience means a more expensive towbar.
Also, generally the towbar and baseplate must be the same brand, however, many companies make adapter knuckles and a few towbars for their competitor's baseplates.
I went with BlueOx, simply because I liked the baseplate better - and that predicated going with a BlueOx towbar.
Also, be mindful of the height difference between the towbar and moho hitch receiver. Different towbars have different allowable specificatoins. For example, some BlueOx towbars only tolerate a +/-3" height difference, while another model BlueOx towbar requires the moho to be 7" higher than the toad.
Generally though, for vehicle mounted towbars, the hitch coupler must be level.
This might mean one model towbar will require a drop receiver (which can cost over $100), while another model may not. So that could significantly impact the total cost of a towbar.
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