Adding additional spring preload will give additional ground clearance- but will stiffen the ride. A better option might be a lift kit - gives ground clearance and a good ride.
To increase the preload, lift the Maverick in the air, wheels off the ground. Measure your current spring length. Loosen the top spring adjuster nut, then tighten the lower one. Would not go more that 1/2". Then tighten the second nut back down to the first one.
CT Racing is a great source for lift and spring upgrades.