trailers

my v20 came from auction without trailer. it is now riding on my single axle trailer that i used to pull my 19' bayliner capris with 79 evinrude 150. seemed to ride fine when i pulled her home. i noticed that most of you guys got dual axles. should i upgrade? only about 4-5 miles to launch from home. but might wanna pull her on vacation one day.tx