I need to run a temporary power line from my service panel (at the meter) to my travel trailer so I can run a 1500 watt electric heater and a few and lights. I have a 200 amp service and need to go 200 feet. What wire size should I use I will probably put it 6" underground direct burial or in a conduit just to keep it safe from damage. This is a temp. line while I work on our home site this fall. Thanks in advance. Allen.