With an inboard jet if you aren't on step (>22 mph in my boat) you are plowing water at high RPM, and pulling a barge unfortunately with a jet isn't practical, especially with the river running about 6mph and a heavy tow, etc. But it is an idea, and I certainly appreciate all the input provided to me as a total newbie in tractors.
There is a freighter on the river that runs three 250HP outboard props and he can take 20,000 lbs up the river, but he charges 24 cents a pound to go as far as my place and he hasn't been that far in 6 years he told me. If I end up getting a bigger tractor I'll have him freight it up and leave it there.
I can go about 30 mph up river (speed over ground) in my boat which can haul 1500# with a few people and gas. My friends boat can haul about 2000 - 2500#, so the TC30 is not out of the question.
I'm half way through my rental day on the B21, and it is really fun to use the loader and backhoe. It didn't damage my lawn at all with the R4s. I have a "wild" 1.25 acre lot also in town that is very much like my cabin property, so I built a rough road in about two hours that is about 1000 ft long, removing two dead stumps, filling in low spots, moving about 6 fallen logs half buried in the vegetation (with no chainsaw required). I discovered that indeed the backhoe is great for getting unstuck. I moved some other cut wood, moved about 25 loads of stuff from my middle lot, etc, etc. This is fun! /forums/images/graemlins/smile.gif
The 21HP was fine, but the hydraulic pump on the B21 has alot more output than a TC18, close to the TC30 or 35 I think. I'm wondering how much difference I would see between the B21's 8 gpm (?) versus the TC18 4gpm pump when using the loader or backhoe.