Welcome to the irv2.com forums and our extended camping family.
First you must know the actual weight(both axles) of your van, as loaded ready to go camping.
Next you must locate the GVW of your van. The difference between the GVW and actual van weight is how much more weight the TT can put on the van.
Finding the actual weight of the TT is next, pay no attention to the sticker weight, it is virtually useless, unless you plan to pull an empty trailer.
Once you know actual weights, use this handy calculator designed by Ken Lenger. Ken Lenger's towing calculator
, once on the webpage, click on "HH_towing-weights.xls" to download the excel spreadsheet.