Jframpey - I think that angle would be greater, your system actually makes me more confident that I shouldn't drag this in there! I have no way of changing my attack angle either...unfortunately due to the degradation of the road on each side.
BizmarksMom - I am not too big a guy to back out if I cannot make it... but with an extremely steep gravel hill with some washout taking place on one side on the and a 50deg corner behind me.... I'm pretty much committed when I go down this hill.. its all in or not in at all.
troubledwaters - I am most definitely not the first one to tow a trailer down there.. but this is Ontario crown land road access camping... the roads are there but not maintained in the slightest. I would be willing to wager that no one with a halfton with regular clearance and a 30 ft trailer is going down that hill with confidence. Most trailers in these sites are 18-24 footers or pop up trailers with nice tight wheel base separation from the tow vehicle.