You may be right,,for me to tell you for sure the towing capacity I need to know if it's a 1500,,2500 or 3500,,and if it's a passenger van or a cargo van and on the spec site I go to it show the van comes with three different size engines and they show them in and tow specs from 4 to 6 thousand lbs....Here's the specs on a 1999 1500 van
<TABLE =tg cellSpacing=0 itxt="1">
<T itxt="1">
<TR itxt="1">
<TD itxt="1">
</TD>
<TD =dj itxt="1">
<H2 =kf itxt="1">PRICING DETAILS</H2>
Estimated Value for Trade-In: $2,389
Estimated Retail Price: $4,647</TD></TR></T></TABLE>
< id=used_inventory name=used_inventory =/inventory/Alt2 method=post>< = value=GMC name=make>< = value=Savana name=model>< = value=1999 name=year>Get Used Inventory: Enter Zipcode > < maxLength=12 name=zipcode>< =sd =submit value=GO>
<H2 =kd itxt="1">Specifications</H2>
< ="/res/vehicleRe/js.js" =text/>
<TABLE ="veh_re2 specs" cellSpacing=0 cellPadding=0 border=0 itxt="1">
<COLGROUP itxt="1">
<COL =left_col span=2 width=331 itxt="1">
<COL =right_col span=2 width=115 itxt="1"></COLGROUP>
<T itxt="1">
<TR =thin_line itxt="1">
<TD colSpan=4 itxt="1"></TD></TR>
<TR itxt="1">
<TD =sect_ing colSpan=4 itxt="1">specifications and dimensions</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Manufacturer Code</TD>
<TD align=right colSpan=2 itxt="1">TG11405</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Wheelbase</TD>
<TD align=right colSpan=2 itxt="1">135.0"</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Overall Length</TD>
<TD align=right colSpan=2 itxt="1">218.8"</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Curb Weight</TD>
<TD align=right colSpan=2 itxt="1">4,589 lbs</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Gross Vehicle Weight</TD>
<TD align=right colSpan=2 itxt="1">6,100 lbs</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Seating Capacity (Std/Max)</TD>
<TD align=right colSpan=2 itxt="1">2/2</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Payload Capacity (Std/Max)</TD>
<TD align=right colSpan=2 itxt="1">1511/2,437 lbs</TD></TR>
<TR ="border_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Towing Capacity (Std/Max)</TD>
<TD align=right colSpan=2 itxt="1">4000/6,000 lbs</TD></TR>
<TR ="row_bottom more_padding" itxt="1">
<TD colSpan=2 itxt="1">Final Assembly Location</TD>
<TD align=right colSpan=2 itxt="1">N/R</TD></TR>
<TR itxt="1">
<TD =sect_ing style="MARGIN-TOP: 1px" colSpan=4 itxt="1">powertrain</TD></TR>
<TR =sub_ing itxt="1">
<TD =col1_4 itxt="1">mfr<BR itxt="1">code</TD>
<TD =col2_4 itxt="1">description</TD>
<TD =col3_4 itxt="1">invoice</TD>
<TD =col4_4 itxt="1">retail</TD></TR>
<TR =border_top itxt="1">
<TD =col1_4 itxt="1"></TD>
<TD =col2_4 itxt="1"><STRONG itxt="1">Engines[/b]</TD>
<TD =col3_4 itxt="1"></TD>
<TD =col4_4 itxt="1"></TD></TR>
<TR itxt="1">
<TD =col1_4 itxt="1">
</TD>
<TD =col2_4 itxt="1">
Vortec 4.3L 6 Cylinder 200 hp Gas Engine </TD>
<TD align=middle colSpan=2 itxt="1">STD</TD></TR>
<TR itxt="1">
<TD =col1_4 itxt="1">
</TD>
<TD =col2_4 itxt="1">
Vortec 5.0L 8 Cylinder 220 hp Gas Engine </TD>
<TD =col3_4 itxt="1">$425</TD>
<TD =col4_4 itxt="1">$495</TD></TR>
<TR itxt="1">
<TD =col1_4 itxt="1">
</TD>
<TD =col2_4 itxt="1">
Vortec 5.7L 8 Cylinder 255 hp Gas Engine </TD>
<TD =col3_4 itxt="1">$1,027</TD>
<TD =col4_4 itxt="1">$1,195</TD></TR>
<TR =border_top itxt="1">
<TD =col1_4 itxt="1"></TD>
<TD =col2_4 itxt="1"><STRONG itxt="1">Transmissions[/b]</TD>
<TD =col3_4 itxt="1"></TD>
<TD =col4_4 itxt="1"></TD></TR>
<TR itxt="1">
<TD =col1_4 itxt="1">
</TD>
<TD =col2_4 itxt="1">
4 Speed Electronically Controlled Automatic OD Transmission </TD>
<TD align=middle colSpan=2 itxt="1">STD</TD></TR></T></TABLE>
<TABLE =abbr_key2 cellSpacing=0 itxt="1">
<T itxt="1">
<TR itxt="1">
<TD =abbr colSpan=4 itxt="1">ABBREVIATION KEY</TD></TR></T></TABLE>