There are three kinds of hitches: bumper mounted, frame mounted, and load equalizing.
Bumper mounted hitches are those which attach soley to the vehicle's bumper. Many states prohibit towing with this kind of hitch, when it attaches to the vechil's stock bumper, since it subjects the bumper to stresses for which it was not designed. Aftermarket reat step bumpers, designed for trailer towing are acceptable for use with bumper mounted hitches.
Frame mounted hitches can be of the type which bolts to two ot more points on the frame, plus the bumper, or just to several points on the frame. Frame mounted hitches can also be of the tongue type, for CLass 1 towing, or, of the receiver type for classess II and III.
Load equalizing hitches are usally used for large trailers. Most equalizing hitches are welded in place and use equalizing bars and chains to level the vechile after trailer is hooked up.
The bolt-on hitches are the most common, since they are relatively easy to install.
Check the gross wieght rating of your trailer. Tongue wieght is usally firgured as 10% of gross trailer wieght. Therefore, a trailer with a maximun fross weight of 2,000 lb. will have a maxi,um tongue weight of 200 lb. Class I trailers fall into this catergory. Class 11 trailers are those with a gross wieght rating of 2,00-3-55 lb., while Class III trailers fall into 3,500-6,00 lb. catergory. Class IV trailers are those over 6,000 lb. and are for use with fifth wheel trucks, only.
When you've determined the hitch that you'll need, follow the manufacturer'd installation instructions, exactly, especially when it comes to fastener torgues. THe hitch will subjected to a lot of stress and good hitches come with hardened bolts. Never substitute an inferior bolt for a hardened bolt.