On the tongue weight a Jayco 806 camper shows a "hitch weight" of 180 lbs which with a max of 200 thats cutting it close. The others I have looked at are in the 130 lb range on the tongue weight. I had no idea they had fiberglass propane tanks. I will look into that. Regarding the hitches I kept hearing people talk about removing the back bumper. Do you find that hitch dealers will do that or is it mainly the do it yourselfers that find that to be the best method? On the 2" vs 1-1/4 I know what you mean, but we have some accessories, i.e. a bike rack with a 1-1/4 that we would like to use. Is one any stronger than the other? Regarding the speed and the tongue weight we would probably not go over 65 in most cases, but if I woould hit I70 and go to Colorado we would get blown off the road going 65! so I would probably need to cruise at 70+
The hitch frame which has the 2inch or 1 1/4th inch receiver is basically the same hitch with a different sized hitch receiver on it. Given the car's frame capacity either hitch works fine for towing no difference. The major reason for getting the 2inch receiver hitch is for the newer bike racks which all work better with the 2inch set up.
Regardless of where your going or plan on going your trailer you select will limit your safe speed. If your purchasing a heavy trailer then packing your car and trailer you will not be doing 70mph or 70+ mph. Also depending on which state you are in vehicles towing trailers often have lower speed limits and yes the fine is usually double to triple the fine you would get if you were just driving the car with no trailer over the speed limit etc.
I have said this over and over and over - if you plan on doing long road trips across hot states and long climbs and expect to carry additional gear and toys along you need to shoot for as light as you can regarding empty trailer weight. That is why I set a max empty weight of 1200lbs when we started our trailer search. As a result we can do 70mph towing the very light compact trailer which sits on large 13inch wheels etc.
When you get heavy - and wide - sitting on tiny wheels your range of stability at speed is decreased given the trailer weight is just that much more load on the tow vehicle.
When towing short distances around town locally you can pack the trailer to the 2700lb limit of the outback and be just fine. When you do long distance travel with lots of various terrain and temps and weather conditions the general rule is that you shoot for half or less than the max tow weight for your basic empty weight this way you can pack gear and people and still be fully within the max towing capacity.
The worst thing people do is see 2700lbs or 3000lbs max towing capacity and they assume its safe and totally 100% workable for their trailer ideas assuming the empty trailer is within the 2700lbs or 3000lbs. Thats not really the case MAX capacity Empty with no passengers or gear simply does not work.
I have towed our large 21ft racing sailboat which on the trailer total weight was 1700lbs behind the car. When I did a regatta in Dillon CO - I opted to borrow a Chevy Yukon given I have towed the boat plenty with the 2.5 engine and the new OB with CVT to know that 25hr drive from CA to Dillon would not be enjoyable with the Subaru pulling 1700lbs + three adults and gear.
However my camping set up because I targeted 1200lbs or less empty weight for our camping rig we can pack the car to the brim with camping gear - toys kids - dogs Parents + the 890lb trailer and the car hardly even notices. We could have easily gone 1200lbs for the trailer but I couldn't find one for the price range I wanted to pay. Closest option was the Jumping Jack Trailer slightly used which ran about $4000 if I could fine one.
I looked at the Jayco's and the Coleman and other classic RV brands all were used super cheap in bad shape and quite heavy.
That is the one down side to having a low towing limit the RV options out there are still being built with the idea that everyone owns V6 and V8 large vehicles so weight and materials are kept as cheap as possible and weight is not really much of a concern.
The difference between a Pop UP and a Tent Trailer is either one and the same or the POP up HARD SIDED RV trailers which are rare and quite heavy and unless you can find a mini one built of light weight materials I've never seen a hard sided Popup trailer that would ever be within the Subaru towing limits.