You can use your quad as long as you stay on designated roads and purchase an ORV tag($15). I don't know much about 78 and 18, but I do hunt area 7 quite a bit. If you are going to be in area 7 there is quite a bit of public land in the southern part of the unit, there is also large sections of walk-in-areas in others parts of the unit. If you do scout this area in the summer you really can't scout the walk-in-areas because they are only really open during the season. Also you cannot camp in the walk-in-areas, but if you wanted to somewhat scout the areas there are plenty of county roads you can drive down and maybe do a little glassing. The public lands you can camp on and scout them anytime of the year but expect to see a lot more cattle than antelope in the summer. Also feel free to shoot coyotes while you are there, there are a lot of them and it is legal to shoot them without a licence.