My 18' boat weights about 2000lbs all total and I read I'm going to need a full size spare if I should have a flat. I have a landing I use 90% of the time that is 3 miles from home and lots of tire shops close by. Do they make just a steel wheel or a basic wheel that could be used as a full-size spare? Trying to find something I can use for those rare times I go farther away without breaking the bank. 22' Ridgeline. Thanks Retired Fisherman on a Budget