You may want to check out your local welding shop.I wanted to do the same thing ,but instead I had one made that goes in a draw tite reciever hitch.It ran me about $195,but I can easily remove it when i don't want it.I also run 39.5"s & it supports one just fine.one thing that I did not do & wished that i had tried is using a ROUND pipe the same diameter as the square hole in the reciever hitch.this way you could remove the locking pin & rotate the tire down easily. ???? maybe this helps ???