I've got a comp crawler, and here's what I found. Go with the HB rovers. Can't beat em'. Been to many comps where everything from ax-10s, to xr 10s, losis, and bergs- most of which were running the rovers. I'm also running the hobbico cs170 for steering in all my rigs. Surprising to note how many guys were running that same servo as well. It'll get warm (or hot)- but haven't burned one up yet. Otherwise, limiting articulation keeps your rig from following the rocks too closely. It's the difference between falling into a crevace, and floating over it with a wheel in the air. If you plan to compete, it's a must. If you don't, its not. I don't use antenna or fuel tubing- though I know many guys who do with good results. I just go with much stiffer springs to get the same effect. More so in the rear than the front- takes care of the torque twist problem that is so prevalent in non moa rigs as well. Hope this helps