On the new Eagle super lites it is easy, Jayco passes the front marker lights through the front wood panel to get behind the fiberglass cap. From there you can just run down and across the frame to tie into the junction panel on the tongue for 12v power or go directly to the battery. On mine I tied into the hitch up light switch on the live side so that I can kill power when I turn my master switch (personnally installed under the sink cabinet) off to make sure I don't kill my batteries should I ever forget to turn them off. Inside the cubbies I installed a 12v light (same as inside the trailer) over top of each cubbie door...TONS of light!!!
2009 Ford F-250 6.4L Power Stroke Cabela's FX4 crew cab short box Super Duty loaded with options
2015 Jayco Pinnacle 36REQS loaded with all options and mods hitched to a Pullrite Superglide 2900 18k
2012 Jayco eagle Super Lite 308RETS - retired