Is there anyway to increase the Max Tow rating of a truck ??? Like increasing the cooling capacity of the Transmission, Airbags under rear suspension plus sway bar etc ....... Thanks
IMHO, being realistic, you will need to decide if you want a grocery-getter, decent-to-good MPG, then get a smaller trailer than fits within your limits.
If you want a vehicle to tow a bigger trailer, get one properly equipped from factory and within it's rating limit.
Even a 1-ton has it's limits.
Going above your towing limits can endanger you, your family, and everyone else on the roads.