need to find out a measurement

Ok i need to know the measurement from passenger tire to drivers tire to know if my truck will fit on a friends trailer. Yes i know some smart answers are gonna be well get a tape and go measure, well my truck is 4hrs away at my parents and i need it to get to my house and my first garage ive ever owned

its a 91 too

you could google track width

man i cant find anything that is very useful

http://autos.msn.com/research/vip/spec_Exterior.aspx?year=1991&make=Isuzu&model=Pickup&trimid=-1&src=VIP&tab=2&sub=4

Says 56.9" track width in the front