I use my homemade welding cart from Harbor Freight, it's a service cart which I modified. It's huge at 24x36, but it can hold my mig, grinders, brush, and all the other equipment.
Heat wrap is also a good idea. When I was experiencing trouble with the header on my truck melting the starter cable, my mechanic advised me to use firesuit material from a used firefighters reflective uniform. His idea's brilliant, it works incredibly well.
Correct me if I'm wrong, both MIG & TIG welding can be used on aluminum and steel and stainless steel...You simply change the electrode to match what you are welding.