The v is a bonus 30" So trailer would be 18' inside plus v nose.
Keep in mind if you get a v nose your tongue will be considerably shorter
you really have to be careful backing up. If v nose is your choice get 1 with an extended
tongue problem solved. Like you mentioned an enclosed would be very heavy unless its all aluminum
I myself have a open 18' open trailer with ramp weighs about 2300lbs