My 2 cents

I have a cut down reunel truck bumper on the front of my Vanagon and it has a
2" hitch receiver which takes my bike rack nicely. I tried it 2 weeks ago and
found it doesn't block my vision entirely, but driving it a night was just
too scary. I can drive with it in the day, but not the night, I have decided to
use the rack on the rear tube bumper from Volks cafe. Mock up your bike on the
front of the van before you buy/employ the front rack. Just set your bikes up
on boxes or something and sit in your van to check out your line of sight.

http://www.reunel.com/Prices/FRWINCH.htm

Thank you for your time,
Emil