Wireless intercomps here.

Whatever brand/style you choose either make, or buy levelers for them. The slightest amount of out of level of the floor causes big differences in weight values. The more ridged the chassis the more pronounced the difference. Weigh your car, then slide a piece of thin cardboard under one scale and watch what happens to the readings. Intercomp makes a set of adjustable pads that you can use to square, and level the pads with. Lock them down and mark the spots on the floor. They also get the car a few inches higher, so reaching the anti roll, or making changes you want on the ground are easier.