BurbMan wrote:
A TT only has 10-15% of it's weight on the tongue, a 5er has 20-25% of its weight on the pin, so the same payload on the truck gets you a bigger TT than 5er.
You've got too many plates spinning here....first figure out what size trailer you want and whether TT or 5er, then figure out if you need to upgrade the truck.
You said the truck did fine with the TT you rented, if you buy one that's similar there's no need to upgrade the truck. If you decide that you like a 5er better, then decide which one you want to buy and from there you can decide SRW/DRW and gas/diesel based on the specs of the trailer.
This^^. I wish I had stated it that clearly.
Rob