I have an already converted over 300TD and currently converting over my 1983 300SD. I originally had them single tank systems but living in NJ I figured its only logical to make a 2 tank set up. I'm putting the tank in the trunk of the SD and in the spare tire compartment on the TD. I'm looking for the cheapest and best way to run lines up to the front of the car. I was thinking rubber hose? Anyone have a link to where they get their stuff from? I'm only doing a feed line not return line. Does anyone also heat the tank in the back for the winter. Just looking for ideas and not trying to dump tons of money into it. Thanks!

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k