When we were first shopping for a gooseneck stacker trailer to pull 2 cars, I was looking for a 36-40' stacker that had some shop/storage space up front and in the gooseneck area. We were shopping for used in the $30-60k range, which limited things quite a bit.
Keep in mind that the gooseneck area generally takes up 8', unless you have a short gooseneck area with an extended hitch. So that means your 36' stacker is really only 28' on the floor. Take out 12' for shop space and you only end up with 16' of space. You probably need at least 14' for a stacker lift.
I didn't see any 36' used stackers while I was searching a year ago.
I ended up looking for 40 and 44', knowing that we'd have room for a 3rd car and more room for tires and spares. The 44' pace GT we picked up has worked out great.
If you can find a 40' Renegade they tend to have nice usable floorplans.
If you've got $170k handy, there is this: