There are no custom-fit front-mounted hitches made for your 1999 Mitsubishi Montero Sport but as you noted we do offer some universal-fit hitches intended for RVs that might work for you.
These hitches are made with adjustable mounting brackets that allow them to fit on vehicle frames of varying widths. They also vary in their weight ratings.
You'll want to have a look at the front-end frame access on the Montero to see if you have enough space to mount one of these. The Ultra-Fab # UF35-946403... view full answer...
We do have trailer hitches and wiring available for the 2002 Mitsubishi Montero Sport. I have included a links to the Montero Sport hitches below. There are some videos for the Sport model and the hitches will install the same on the 2002 as the 2003. All of the hitches come with instruction links on the right hand side of the product pages so you will be able to see ahead of time exactly what a hitch installation entails.
As far as wiring, the Sport model uses the Tow Ready Wiring, #... view full answer...