There's another mention of this install elsewhere on the forum . And many positive replies regarding sparks, vapor and confined space. My reasoning on my install went like this :
PROS : I won't be driving away plugged in as I would have to step over the cord. No punching holes in the van. In my case this is a good entry area to the interior for AC (panel location). With a few adjustments I should be able to close the door all plugged in.
CONS: Fuel vapors present with cap off , and a spark when unplugged and a load . Would make a good FAIL video ( if no injuries ). A place for water intrusion into the inner sheetmetal if seals are not maintained.
Owner would have to have a FOOLPROOF unplugging routine in place , turn off all loads, gas cap tight, good ventilation, etc.
As for the fumes, the dash will lite up if the cap is loose. Part of the emission system. All vapors are routed to the charcoal cannister and recycled back to the engine when running.
I used a firewall grommet all siliconed up to enter the interior to keep water out. The only hole cut (so far).
Proceed at your own risk.
And I also like other member's rear entry (of AC) so if you do drive away , the cord just gets left behind for the next camper.