I met a couple in their late 60's a few years ago - the year 6 or 7 I think - just outside Carrion de Los Condes, on that Roman road. They had a two wheeled cart, inflated tyred wheels a little smaller than a bicycle, maybe 24 inch. The body was aluminium and there were two arms that fed forwards, very similar to a dog trap or donkey cart - but smaller - the chap just hefted it and held onto each pole to pull, although there was a hip harness available (he said he never used it). They were a German and English couple and lived near the Ruhr. Had walked from home and were having a wonderful time. They told me that they had been walking all the different routes for years. They were talking of thousands of miles with their trailer in all weathers and over all terrains.
I had seen them camped by one of the defunct water pumps on that long straight stretch when I drove by in the evening and they caught up with me the next day and stopped for tea. (Amazing stretch actually, walking along a genuine and still extant Roman road ... extraordinary!).
They were so lovely that I wanted to take them home with me. So jolly, so calm, so life-positive, so loving to each other. Deep respect. The amazing thing to me was the large amount that was on the trailer that they seemed to have no problem taking with them. A fairly large tent, full cooking facilities, water, food, all bedding, clothes, and just about every 'necessary' extra you could think off. They never stayed in refuges, except just every now and again to launder and full shower. They would just get to a spot that seemed pleasant and set up camp. They cleared camp each day, taking all litter with them, and walked in a very relaxed manner - no rushing at all, utterly content.
I asked them about weight and terrain and tiredness and so on but they were completely unfazed. Mrs couple walked unburdened - she was older and frailer (they weren't actually frail, strong and hearty, but of the two she was the frailer).
I asked for permission to try it out and it was so easy. The body when pulling feels free and the load seemed easy. They said that they loaded to put weight a little to the rear so that when you brought the poles down to pull it had a lightness to it. When I tried it I had to agree - but, this was on level ground, and I did think then that you can't beat the laws of physics.
If you are carrying a weight in an ascent of 1000 metres, you carry the same weight whether you carry it or pull it or cycle it - the energy expenditure is the same. Also, I don't know if I could have put up with having both my arms and hands constantly pulling a trailer - I think I may have preferred to be harnessed in to it so that my arms were free - but they were the experienced ones, not me.
So, in answer to your question - their experience, and this my anecdote says - go for it!!!
p.s. You can buy this stuff in the uk called Green Slime. You put it into your inner tubes and it seals punctures before they happen - or something like that.