Best advice is to get as much experience as you can, with what you've got now.  The lower the truck, the smaller the tires, the less gear options, etc., the more finesse required to make it over obstacles.  It will make you a better driver in the long run, so that when you can afford to do a SAS, get duals, lock it up front and rear, you'll know your truck well, and be able to run obstacles very well.  There are people on here with very nice rigs, that go places many others get some serious body damage from, because they are simply better drivers.  I'm not knocking on anyone, because some people don't care about body damage, but the more skills you develop now, the better wheeler you'll be in the future