Two years ago I gutted an 88 Lil Bigfoot and completely refurbished it.
I sold it for $7500.00.
The only thing that I didn't change were the cushions, furnace
as they all worked well.
A Lil Bigfoot is a wonderful trailer, BUT very rare so you may pay a premium if that's what you want.
You may find a Scamp or other less rare Egg for less and the axle
replacement will not cost as much.
My Lil Bigfoot had brakes and a completely dead axle
which I replaced.
The frame rails where the axle is mounted are not parallel as required by todays axles.
A competent welder can make the modifications to install an axle but anticipate around $750.00 including the cost of the axle.
I never checked the tongue weight but you should not have a problem with you Forester.
The material had come loose from the foam insulation.
I gutted the trailer and had Scamp Rat Fur professionally installed.
Any kitchen cleaner will kill the odor.
I like the Spray Clorox Cleaner + bleach
The bunk is exactly like the bunk installation in my Scamps and I have had my teenage grand kids sleeping in them.
Plug the trailer into his vehicle and check the exterior lights
There should be a 110V line to plug into an available 110 outlet.
Insist he powers up the 12v lights
if they don't work when plugged into the vehicle.
The battery depends on your camping needs.
If you are going to camp where 110V is available the standard deep cycle group 24 is OK.
If your a boondocker then you should consider a group 27 deep cycle battery as the useable charge will last a little longer.
I like Wal Mart for buying battery's as there is usually one wherever you go.
There is nothing special about trailer battery's other than you want a deep cycle battery which is readably available.
DON"T buy from RV stores unless your independently wealthy.
Ebay, Wal Mart the internet and big hardware stores usually can supply what you need.
Of all the trailers I have refurbished since I retired the Lil Bigfoot is the only one I regret selling.
For some reason I didn't notice the add or the pictures.
It looks like a nice clean, well cared for Egg.
It also looks as if the axle is DEAD and needs replacement.
I would find out the cost of a complete axle replacement.
Since the Big foot is a Canadian trailer you may find someone familiar with changing out the axle.
Since frame modification is necessary also ask for a trailing axle installation.
The trailer looks nice so I think, from looking at the pictures, the axle will be your biggest expense.