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<blockquote data-quote="noleafclover803" data-source="post: 506819" data-attributes="member: 551621">We are building a mobile Video/Audio trailer to attach to the back of our cars for tailgating at football games this year. We boxed it in with 2x2s and plywood, and are carpeting the inside and painting the outside. We plan on having two outward facing 20 inch TVs (with a window that opens up so you can sit outside and play xbox, PS2, etc). We are also putting&nbsp; my 15&quot; Rockford Fosgate subwoofer into it along with some other smaller speakers. My problem is we will be running power from the attached car (or a car next to it).If I mount the amp in the trailer..I can&#039;t ground it because its not attached to the car battery (the metal frame), unless the metal chassis of the trailer conducts through the trailer ball into the car frame.My question is, at what length does a grounding wire become unsafe? I guess I could always just mount and power the amp in my car and run longer speaker wire...but wheres the fun in that? Ideas? Also, is a 300 watt inverter big enough to power two TVs and a couple PS2s? One TV is rated at 110W, the other at 140W. I ask because I found one on sale for $30.If your interested I&#039;ll put pictures up also.</blockquote>

[QUOTE="noleafclover803, post: 506819, member: 551621"] We are building a mobile Video/Audio trailer to attach to the back of our cars for tailgating at football games this year. We boxed it in with 2x2s and plywood, and are carpeting the inside and painting the outside. We plan on having two outward facing 20 inch TVs (with a window that opens up so you can sit outside and play xbox, PS2, etc). We are also putting my 15" Rockford Fosgate subwoofer into it along with some other smaller speakers. My problem is we will be running power from the attached car (or a car next to it). If I mount the amp in the trailer..I can't ground it because its not attached to the car battery (the metal frame), unless the metal chassis of the trailer conducts through the trailer ball into the car frame. My question is, at what length does a grounding wire become unsafe? I guess I could always just mount and power the amp in my car and run longer speaker wire...but wheres the fun in that? Ideas? Also, is a 300 watt inverter big enough to power two TVs and a couple PS2s? One TV is rated at 110W, the other at 140W. I ask because I found one on sale for $30. If your interested I'll put pictures up also. [/QUOTE]

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