Add on helper air springs, the red "wire" is most likely the inflation tube and the fill valve should be accessible somewhere near the hitch. Firestone makes them for a lot of vehicles.
Your motor home looks level, the hitch installed low probably to suit what ever previous owner was towing,the trailer you are towing needs to be level otherwise it will drag at rear, mount receiver higher, get rid of the rollers, select the correct ball mount for the receiver to get correct tongue height for trailer.
The distance from front wheels to rear is a compromise, longer wheel base would make turns more difficult, backing into campsites more difficult.