Maybe it's just me, but are you towing a fifth wheel trailer or a travel trailer? Give us the make and model number of your trailer so we can help you with answering your query. If it'sa fifth wheel, then a 16 to 18k fifth wheel hitch from any manufacturer should do. If it's a travel trailer, then a appropriately sized weight distributing hitch will do. Both types of hitches are highly engineered load and stress bearing devices and to homebrewone, to save some money, is nota wise thing to do.
Edited by: Hamops
Helen & George VE3INB and Max (Bichon Frise)
2006 Silverado 2500HD D/A,
2006 Cruiser CF30SK