I just recently got 22's put on my 2006 Screw with Kuhmo 305/40/22 tires. Will I still be able to tow my boat (approx 3000 lbs with trailer) without putting too much stress on the smaller tires? Thanks.

 

What is the load rating on those tires (look on the sidewall) compared to the stock tires?

 

Yes, thats a tongue weight of around 300 lbs, that will not be a problem for any truck tire on the market to hold. your fine

 

It's a little more complicated than that.

You have low profile tires which make it easier while loaded to accidently ding a wheel with even a small pot hole...which could cause a tire or wheel failure.
Secondly large diameter street wheel like 22" do not have much of a load capacity like normal 16-17" truck wheels....and usually don't even have a weight rating greater than 1700#'s for each wheel. Next the tires to have the speed rating with that low of a profile tire can not be constructed to carry loads and have a load range of A or B. Kumho doesn't list spec of their web site so you will need to look on the tires for weight capacity.

Now to try and answer the question:
Pulling a 3000# boat.
You could possibly have only 300#'s of tonge weight which will have no significance on the truck weight or tire choice.
You could have a 3000# boat with 600 plus #'s of tongue weight which your new tires possible could not handle.

It is a little difficult to answer without a little more information on the boat/trailer besides just the wight of the boat.

 

Thanks for the info guys. The trailer is a standard "float-on" for a 21 ft boat. It is long and aluminum so therefore the weight at the tongue is relatively light; I can lift it off the ground "on a good day" so I would say the weight at the tongue is no more than 350-400 lbs.

 

45s and you would be real good

 

350# tongue weight is the absolute minimum that should be there - 3000# boat, 500# trailer (REALLY light trailer) @ 10% tongue weight. Bumper pull trailers should be minimum 10% to max 15% - 13-14% is where they tow the best. You are really probably below 10% - which means the axle is mounted too far forward on the trailer.

Anyway, all that said, the aluminum trailer doesn't cause the tongue weight to be low - length doesn't really matter either, although a longer trailer will tow better with a lower tongue weight. Bottom line is (as Colorado said) you need more details for towing with those wheels and tires.

The game plays like this...
Scale the truck (you need a rear weight) be sure to include everything as loaded for hauling, including passengers - that gives you a real rear weight. Check the tire and wheel capacity (could be a lot different). The weakest link in the chain is the thing you are looking for - if the are the weak link and tires are rated at 1700# each, you have 3400# to work with - less the rear weight of the truck (I'd guess about 2600# although I've never checked). If the tongue weight is 400#, based on the rest of the details being in line, you'd be OK.

 

Thanks. The load rating on the side of the tires is 2600 lbs max load. The tires are Kuhmo Ecsta's, specifically made for large trucks/SUV's.

 

2600 sounds like more than enough for your load.

 

What the rim limit? It could be lower than the tire. You just want to make sure the weakest link is strong enough to do the job.