I do all my wrenching in the field, where I live... To change oil have a proper receptacle and put a couple trash bags under them for spills... Same for tranny though this can be tricky... Lube in the same way, collect any excess up with a garbage bag... For any fluids I have it collected and use a funnel to pour the old into the fresh containers after filling up what ever I am working on...<br /><br />The key is to get the job done without any spillage, hey treat the ground your camping on with the same respect you would have with your homes drive way... It is all doable to include a host of other projects...<br /><br />Remember to always recycle the fluids or dispose of properly, no one wants to be "that" guy who doesn't...