mrslowski-
I have not had a problem buying products directly from LSL Products (link
here).
You may want to consider the LSL Products AMP-L-START. It is like the TRIK-L-START, but with a bit more capacity and output posts instead of wires. iRV2 user "FIRE UP" installed an AMP-L-START on his coach. A link to one of his posts, with pictures, is
here. There are other posts in the same thread with pictures.
As "Twinboat" said, there are other products that do the same thing. I have not used the "...-L-START" line, but I have used another LSL Products product, and it's been reliable.