If you minivan's engine is anywhere near 175 HP I would think you'll be fine. My Ram has the smaller engine and towing is great. Also I take into account that the motor has over 170k miles on it so the actual HP is less than when it was new.
I have an old 15" LCD TV that I've been using in mine, but it has no digital tuner so I have to always tote that box with it also, which sucks because the TV has a 12V input in addition to AC power. I think an under the counter TV is a great idea!
Is there a mount that fits nicely above the counter in our kitchens? I found this but not sure if it latches for travel: