During the assembly of my RT-700, I didn't put the caster wheels on the right side as the instructions stated. I put them on the left side instead because I noticed I could raise/adjust the caster wheels just by adjusting the nut portion on the caster bolts CW/CCW to raise or lower the grill for leveling. This allowed me to raise the left side a little more and get more of a slant towards the drip bucket. The fixed wheel side can't be adjusted for leveling so they are better on the right side than the left in my view. The only reason I believe they wanted the casters on the right is because the pull handle is on the right to move the grill around. I don't move my grill around much, and when I do, the control shelf is strong enough and the left is the side I want to move out away from the wall anyways.
I have been foiling my drip tray to date with heavy duty nonstick grilling foil. I have the nonstick facing up towards the grates. I have been removing the drip tray and hitting it with a garden hose when I see a build up of grease on it before a cook at high temps. The grease washes off nicely and the foil is lasting through quite a few cooks. Works for me with no scraping or re-foiling very often and no flare ups to date. I have about 7 or 8 cooks on my current foil.