Did I make a mistake in Financing? How long do you finance?

oh boy....stupid me.... purchased my camper last summer... 2014 primetime rv... first camper ever... I didn't know any better... none of my family members nor friend camp or own campers so this was my wife and I sole decision...anyways, stupid me, not knowning any better financed this camper for 12 years... I didn't know any better.. spoke to my credit union for the financing and they told me most people finance these for 12-15 years..
I admit, I should have researched more, but I didn't... has anyone else made a big boo-boo like this? and no, I cant afford to double up on my monthly payments right now to pay off sooner... do these campers with proper care, generally last this long? I don't want a camper breaking down in two years with ten more years of payments...how bad are they to trade in? do they depreciate just like a car?
I know its all too late now and we cant change this, but im just wondering if anyone else has ever made a boo-boo like this and financed the camper this long? or am I the only poor sole...LOL